This certainly looks like an advance over your existing tripod. I should say that I am not familiar with this particular model but I have tried several Vanguard tripods.
I think that you may be on course to making the same mistakes that I did. I started with a budget model, upgraded, upgraded again! Finally I bit the bullet and got a proper tripod! Yes it was expensive, but cheaper than the total of the tripods that I had bought before and discarded and (more importantly) it will probably never need replacing! In other words if I had bought a Gitzo in the first place it would have been cheaper and I would have had a top quality tripod in the first place instead of several years of faffing about with bendy things.
If the likes of Gitzo and RRS are simply too expensive (they are FAR from cheap) then have a look at the used market. Either of these brands will outlast most of us and can often be found quite cheap used, for example a picked up a Gitzo 3 series Carbon fiber tripod a few years ago for about $125 in your money. This tripod was quite happy with 600mm F4 + lenses, very rigid and not too heavy (only 200 grams more than the Vanguard!). Have a look at FleaBay and similar - if you are patient there are bargains to be had.
Another alternative is to have a look at the Chinese/Korean etc tripods. They make some very nice products at more sensible prices. A particular favorite of mine is the Feisol 3342. Nice and rigid, ridiculously light and great for lenses up to 300mm F2.8 or so;
http://www.feisol.net …s/tournament-tripods.html
Yes a bit more than you want to spend - but far more rigid, about half the weight (so you will actually bring it along) and better built.
In a nutshell I would say wait a little longer, save a bit more and get a quality tripod as it is cheaper in the long run. Just my thoughts.
Life is for living, cameras are to capture it (one day I will learn how!).