For your purposes, a 5DII would be fine. 5DIII too, though it would be a bit of overkill since none of your shooting is moving subjects, where the Mark III has distinct advantages.
I use both... a pair of 7D and a 5DII. They complement each other well.
I use the 7D for action, sports, general purpose... AI Servo stuff is where the 7D excels and is about 85 or 90% of my shooting. The crop cameras also allow for a smaller, more mobile kit of gear, will always be my choice for telephoto work, which is a lot of what I do.
I use the 5DII mostly for stationary subjects... much like what you say you shoot: landscapes/cityscapes/seascapes, portraiture, some macro.... One Shot focus stuff, where the 5DII is more than adequate. FF is great for wide angle work, not so much for telephoto.
I'll use the 5DII any time I want capability to print larger... really large (say upwards of 16x24, which I've printed quite successfully from images with lesser crop cameras than 7D). I'll also use 5DII for extra high ISO shooting, it handles high ISO noise a bit better than 7D... gives me about one extra stop over 7D. If you shoot JPEGs in-camera, the 5DIII would be even better... two or more stops higher usable ISO. RAW isn't much different than the 5DII (but the implication is that it could be with proper post-processing/RAW conversion.)
Will you see the difference? If you don't often use high ISOs, primarily post images online and/or make 8x10 or 11x14 prints... no, not really. If you tend to crop heavily or make large prints, or use quite high ISOs (6400 or above, IMO), then you will find more obvious IQ differences.
If it will be your only camera and you have rare need to shoot moving subjects, 5DII can handle it (in a simplistic way) and will be fine. But if it will be your only camera and more of your higher priority shooting demands catching moving subjects, go straight to the 5DIII.
Plus, you have to consider your lenses...
Much of my gear and I come from a film background, so I already had a complete kit of "full frame capable" lenses when I got the 5DII about 4 years ago. Prior to that I had shot for some 5-6 years with crop only, but I only had one "crop only" lens (a third party ultrawide - Tokina 12-24 - that's actually partially usable on FF, up to 18 or 19mm wide). Prior to switching to DSLRs in 2004, I had been shooting film (so "FF") with Canon gear and had about a dozen lenses. I only had to sell off one and replace it (the ultrawide).
I have acquired a couple more "crop only" lenses since, because there are times I just want to minimize my gear load and only take the 7D and a few lenses. (Full frame lenses tend to be larger, heavier and more expensive).
Since they can use both EF "full frame" and EF-S/crop only lenses, you actually have a significantly larger choice of lenses with a crop camera... Though, to be fair, the Canon system FF lens selection is pretty darned good as well.
Half your lens kit wouldn't be usable on 5DII or III. You'd have to spend more to get another lens or two. And if you sell off the 7D and crop lenses to make the switch, you'll actually be dumping your two best lenses!
Have you handled a 24-70? Nice lens, but it's not small or light or unobtrusive, so I'm not sure I'd use mine for street photography. Also, I like it better for portraiture on a crop camera... It's just not my favorite portrait lens on FF, for me it comes up a bit short. For FF portraiture I tend to use 85/1.8 and 135/2... or 70-200/2.8 or 70-200/4 if I need a zoom.... Or, believe it or not, a 28-135mm is a great portrait zoom on FF (when a large aperture isn't necessary). I can't justify spending 3X or 4X as much for a 24-105, which certainly is better built and sealed but really doesn't improve much, if at all, on the 28-135's image quality, AF performance, IS, close focusing ability. OTOH, the 24-105 is often offered in kit with the FF cameras.
Tough decision... considering what you say you shoot a FF camera seems the ideal choice. 5DII would be a step down in some respects from your 7D... 5DIII less so, but at double the cost and doesn't really add a whole lot that's critical for what you say you shoot. And maybe you don't want the size, weight and cost of converting to FF from crop. And you've got a couple of the best crop only lenses already. And 7D is quite capable (Canon's new sensor in the 70D looks to have great IQ for a cropper, possibly higher usable ISO too, though it's a bit early to tell).