You don't need much for still photo editing.
For video, you're saying smaller files which suggests maybe you mean basically sometimes dealing with a video but definitely not building around the idea of full-on video editing, I assume?
You won't see much performance increase over 4 cores in Adobe's pixel editors and lightroom. But you could shoot for more cores if you ever plan on really pushing into video more. Short small videos will be fine with a quad core.
You can't have too much RAM, so get all you can. Seems you already went for 32Gb, that's great. 8Gb is a starting point in my opinion, but you can also just test it yourself (load all your software, load the typical load of images, start editing, turn on resource monitor in Windows and see how much RAM you actually use). It also depends on whether you let windows handle memory and turn off it's ability to use a disk for memory plus your RAM, or if you want to have it all in your RAM and disable that (for performance purpose). If you go that route, consider as much RAM as you can (16~32Gb). I use 16Gb and never fill it with several images loaded in photoshop and lots of software running. But it depends on what you're doing.
SSD for your scratch disk and working disk. Fat HDD for storage (temp storage).
You don't need a GPU unless you're specific using software that truly benefits from it, and only if it benefits it greater than what a good CPU can do. GPU's have a lot more place in video editing these days than still-image pixel editors still. Maybe one day that will change. But there is some support for GPU's in the later versions of Adobes RAW editors and pixel editors. Unless you're looking to game or something, I'd just put this extra cash into the best CPU you can muster and copious memory. You can always add a GPU later if you find a need for it. A very basic GPU may be nice for simply handling a display or three, if your motherboard can't do it. Your call.
Budget in a good uninterruptible power supply, worth it to avoid brown/black outs of electricity while working so you don't lose a ton of work. Just needs to handle the machine long enough to save stuff and power down, or just to survive a power flicker and not dump everything. Obviously up to you if this is important or not. Depends if you've lost work due to a power ficker or outage before.
I haven't seen anything mentioned about the display or multiple displays you want to work with? That goes into the budget too. Unless you already have displays you're happy with? Personally, I consider displays to be very important, they're the end product of what your machine is doing that you interface with and command, so having big, excellent monitors to me is essential over some other things. And multi-display is another wonderful things that I consider essential and not just a luxury. But this is my own perspective, just thinking out loud.
Do you have links to pre-built places where you live?
I get you want to buy it pre-made, but there's a satisfaction to building your own, and knowing how to replace bits of it, and trouble shoot that is valuable in the future when things aren't going right or you need to replace something...
Very best,
)
