New gaming build questions

Hi, so sorry if this is in the wrong section or a question asked and answered multiple times before, but I can't seem to find an answer after some searching.

I'm currently able to buy a relatively well-powered build (Phenom II x4 955BE, 4gb DDR3, ASUS 5770) for $400-500 (still negotiating price) on craigslist.

The thing is, its power supply is relatively weak (Rosewill Green Series 630 watt, ), its motherboard is a microatx 890gx chipset ( ) and its case is an old mid-tower (Apevia X-Cruiser, ).

My options are either to replace the 5770 with a 6850, or buy a second 5770.

I have no idea if A] the power supply will handle 2 5770s, B] the motherboard has enough clearance for two double-slot Asus EAH5770s (also without blocking too many SATA ports, I need at least 3 open), and C] the case even has enough room for both cards.

Also, if you guys have answers to a couple other questions I can think of, that'd be great:
1) Is a cheap USB-powered Wifi dongle powerful enough for my 25/25mbps up/down FiOS Wireless G internet? As it is, there will be no PCI slots available if I Crossfire two 5770s AFAIK, so a USB dongle would be my only option.
2) Would a Hyper 212 Plus CPU heatsink + fan fit in this case and not obstruct the motherboard's RAM/PCI-e slots/anything else important?
3) If I were to buy a 6850 as a replacement to the 5770, would I be able to put it in the bottom PCI-e slot rather than the top? Only reason I would do so is so the PCI slot right beneath the first PCI-e slot isn't covered up, so I can put a Wireless G adapter in there.
4) Is a Phenom II x6 1055t worth the extra $20 or $30 dollars over the 955BE? I would probably overclock either one (not by much, since it would be my first overclock) and I would be playing CPU intensive games like GTA IV and Crysis.

The only reason I would consider buying this build is so I'd save enough money for an upgrade to my 19" Dell 1440x900 monitor to a 23.6" 1920x1080 ASUS monitor. Otherwise, I'd keep my current monitor and go with this build that I selected myself, which is obviously better, except no monitor upgrade for me:

Any and all advice you guys can offer would be great. My budget is preferrably under $875, can push to $900 if need be. Main purpose would be for gaming.
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  1. That's not a bad offer but you can get something like this in your budget:

    GIGABYTE GA-870A-UD3 + AMD Phenom II X4 955
    G.SKILL Ripjaws Series 4GB (2 x 2GB)
    SAPPHIRE 100315L Radeon HD 6850
    SAMSUNG Spinpoint F3 HD103SJ 1TB + COOLER MASTER HAF 912
    SeaSonic S12II 520 Bronze 520W
    Acer G235HAbd 23'' 5ms 1920x1080


    Buy the HSF later.
  2. Once Full HD gaming on the table i would look to move past a HD 5770 for fresh builds as it wouldn't be ideal while a beefy 80+ 650-700 would be good to go for a HD 6850/6870 CF even so that is a guide if u are intending to go CF For just gaming no Premiere Pro/Render/Encode 925-955BE + 4GB DDR3 good to go
  3. Quad + HD 6870 + crossfire capability?

    HD6K: single/CF review

    Tower $696AR

    23" LCD $150 Free Ship

    $846AR in total, get an after market cooler if intending higher clocks ^^
  4. Thanks so much for the replies!

    I'm actually leaning towards building a nice, high-end PC first and not skimp on case, processor, etc. and then later upgrade my monitor. I can live with 1440x900, especially if it lets me run Crysis on Very High with 4xAA no problems. :D

    Also, browsing some forums, I see a deal for a MSI NF980-G65 AM3 NVIDIA nForce 980a SLI HDMI ATX motherboard, CORSAIR XMS 4GB (2 x 2GB) DDR3 2000 RAM, Phenom II X6 1090T BE processor, Hyper 212+ CPU cooler and XFX 5870 all for $555 shipped. This seems like an amazing deal to me and falls within my budget perfectly, I think I may just go for it.
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