So, what is your budget and currency then?
What are you building the system for exactly- what is it going to be used for?
Do you need any monitor(s) included? If not, what monitor(s) exactly will you be using with this system?
Do you need a keyboard, mouse, or other peripherals?
Do you need an operating system?
Will you overclock?
Anything else we should know?
danielkempster1 wroteCPU: i9-10900
I wouldn't. Kind of pointless going Intel and then buying a locked SKU that you can't overclock anyway. Intel's only real advantage over Ryzen at this point is single core performance, and if that's what you're after, buy an unlocked SKU like an i7-10700K or i9-10900K, so you can OC it to 5GHz+. The locked i9-10900 is only ever going to hit close to 5GHz on 2 or 3 cores utilised, and only IF you're cooling is up to par.
Either way, I'd be looking at Ryzen instead, and I'd really just wait a few days(October 8th) for AMD to announce next generation Ryzen CPU's.
danielkempster1 wroteCorsair 850Watt 80+Plus Gold (Do I need more than 850W?)
No, you don't need more than 850W. You don't even need anywhere near 850W.
650W is plenty for a single GPU system, even with an i9-10900K.
danielkempster1 wroteWater cooling or air cooling? How many fans? Do I get a water block for the graphics card? Will these specs do okay with just air cooling?
Whatever you prefer. If you want to liquid cool, then that's your choice. Whether your specs will "do okay" with air cooling depends entirely on which components you end up buying- same goes for "how many fans".
danielkempster1 wroteCase: What's the best one (with a glass side) for these specs? I want the build to be clean and look sleek.
There isn't a "best". Different cases do better in different scenarios, but regardless case is a fairly personal choice so the best bet is to have a short list of good quality cases, and then decide which one fits best for your based on price and aesthetics.
Phanteks P400A, and P500A. Fractal Meshify C, and S2. Cooler Master TD500, H500M, NR600. Lian-Li PC-O11 Dynamic. Those are my typical go to cases for decent airflow, at a variety of different price points. A few of these will need outfitted with aftermarket fans, some will be fine with the included case fans. Again, what you should do for fan set-up though will depend entirely on which case you decide on in the end, and what components you're putting inside the case.
danielkempster1 wroteLighting: Does strip lighting just look tacky? Am I better off just getting RGB fans
Entirely up to you. Totally personal choice. I can say that RGB fans are going to be a bigger headache than just throwing in an LED strip though.
danielkempster1 wroteGraphics (here's a choice or potentially a new suggestion - this is one I'm really not sure about (I want at the very least 8GB)):
1. RTX 2070
2. RTX 2070 Super
3. RTX 1080ti
I'm just really not sure what one to get with the other specs I'm getting.
No. Don't buy any of these. RTX 3070 should be available end of this month for $500 and is meant to offer similar to 2080Ti performance. No brainer to wait for an RTX 3070 over a 2070($400) or 2070 Super($500).
Also, AMD are announcing Navi 2 GPU's on October 28th.