Upgrading graphics card, advice would be most welcome

I know this isnt the answer you want, but...

Since you have to wait untill July anyhow, it might be worth waiting to see how the 9900 vs 48xx plays out. That obviously makes picking a motherboard hard, but if your really looking for a long time solution, it would be silly to pick something just before the new release.

I agree, wait for the reviews on the new cards and make your decision then.

Nope dont wait because no one knows when will 99xx or HD 48xx comest out exactly
also we dont know the %100 true specification of them
if u want to wait u cant ever get a new rig
between HD 3870X2 and 8800GTX i say go for 8800GTX because although the HD 3870X2 may beat a 8800GTX in some games but the difference isnt much and 8800GTX runs cooler and is quieter than HD 3870 X2
8800GTX is a solid card, i have one in my rig and i love it (i play @ 1680x1050 no problem with any single came @ very high even crysis   )

Core2Duo E6600@3.2
ASUS P5KE- WIFI
SEAGATE BARRACUDA 500GB 16MB
OCZ VINDICATOR CPU COOLER
OCZ 4GB REAPER DDR2 800 4-4-4-15
OCZ 8800GTX @612/1080(=8800ULTRA)
OCZ PROXSTREAM 1000WAT
THERMALTAKE ARMOR CASE
LG M228WA MONITOR
XP 32 + SP3 RC1

You both have a point, I reckon.
But it does make choosing the motherboard hard.
Let me change the question : if you had to choose between the 3870X2 and 8800GTX what would it be? I'm currently in favour of the Nvidia's card.

Tough call...

I think i told u   i said go for 8800GTX

between HD 3870X2 and 8800GTX i say go for 8800GTX because although the HD 3870X2 may beat a 8800GTX in some games but the difference isnt much and 8800GTX runs cooler and is quieter than HD 3870 X2
8800GTX is a solid card, i have one in my rig and i love it (i play @ 1680x1050 no problem with any single came @ very high even crysis  )

The 3870X2 is faster in some games, and it uses much newer technology (55nm as opposed to 80nm), but it costs more. Buy whatever you can afford. The 8800GTS 512MB offers better value/$ than both, but it's slower than both too.

I'd get an X38 motherboard just because X38 is a better chipset than the 780i. Something like Asus P5E or GA-EX38-DS4. Then in July you get to choose between a single nVidia card or a single ATI card or two ATI cards. I don't think you really need two cards, at 1600x1200, and with cards that will beat both the 8800GTX and the 3870X2. One of those should be plenty even at higher resolutions IMO. Why don't you decide that in July, when the cards and the benchmarks are out.

Alright, I'll wait. But I'll get X38, I think.

I prefer ATI cards but I would say of the two option you give go for the GTX, The 3870X2 is a transitional card made just for tempory bragging rights to having the fastest card on the market, My worry with this scenario is how long will they continue driver support for such a card ?
I have to agree with aevm that the res dosent need two cards and as such would personally be waiting for the 4 series to run a single card.
Mactronix

well what about the 9800gtx for 300 or if you have an sli board 2 8800gts

edit: whoops haven't looked at the charts in awhile 9800 gtx sucks just go with the 8800 gts and if your not gonna do sli get a intel board

X38 board is good choice for now. When you buy in July there will be new cards out, and then you can make your decision (just no SLI, but most likely a single high end card will be more than enough for your resolution)

I personally would stay away from the GTX. While it is still a behemoth, and will play like none other, unless its within $50 of a G92GTS, I dont feel that its worth the extra cash.

Okay, I'll be waiting until july, like you guys have advised me. I'll get the X38.
Thanks!