Can anyone show me a computer build with i7 and ati 4890 for 700-800$!

Doesn't exist. That is a $1000 build minimum. If you can't afford $1000, then i7 is not for you.

You missed the quality case, PSU, and HD. And a DVD drive? i7 was not meant to be this cheap, Core i7 or not that system would not be fun to use. That HDD would be 1/4 full just installing Vista x64. And low quality case, low quality PSU would not be fun, let alone installing your games/Vista without a DVD drive? If your gaming then look at a E8500 system, or AMD 955 system, otherwise save up or wait for Core i5.

Not having a quality case isnt a big deal all it does is sit there(and do i really need to be able to stand on it), I didnt realise that it wasnt a dvd drive made this list quite quickly, a lg dvd burner costs $10 dollars more, PSU wise yeah its probably is a good idea to get a better psu the COOLER MASTER eXtreme Power Plus RS-500-PCAR-A3 500W costs $30 after rebate and should be sufficient. A Hitachi 500GB harddrive costs $45 after rebate so the new total cost is $829.40.

But you could just go with a cheaper graphics card somthing like a 4870 for $125 and that would bring the total down to $764 and that way you would have $36 to spend on improving other parts of the system.

Read my second post, also you missed the part where it says 1gb x 3, so its 3gb and that way you get to use triple channel aswell

i say Phenom II for that price range

Yep: Pay what tho owest! I7-users like to keep-out the riff-raff.

Hey guys give shrex a break; the OP asked a question and got a pretty good answer. He took the time to try to answer the OP's question, in fact his is the only attempt at it that was taken. He put in more effort that the OP, which is a peeve of mine, posters not putting in any effort to answer their own questions. Are any of the components debatable? Yes, that's what the forums do debate. With some time to buy on sale some of the debatable parts could be upgraded to better parts for the near same money. Point is shrex did put together a system in the range that the OP asked about. I would say to the OP as others have that the system you really want is going to cost you more than 700 bucks. I think that you want it for gaming? If so and you really have to have an i7 think about 1500+.

From New Egg
search for mobo with cpu combo deal- INcluded is combo deal# if you can search on new egg. This is a Copy of my receipt
Item List:
1 x ($109.99) CASE LIANLI|PC-7BYCF BK RT - Retail $109.99 ( can get a cheaper case for 35 dollars after rebate from raidmax)
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1 x ($19.99) INTEL GIFT INTEL BUNNYPEOPLE - OEM $19.99
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1 x ($99.99) MEM 2Gx3|OCZ OCZ3G1600LV6GK R - Retail $99.99 ( you can get 3gb for cheaper and save another 20-30$)
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1 x ($239.99) MB ASUS P6T 1366 X58 RTL - Retail $239.99 (can cut cost by going with dfi x58 micro atx board for 189)
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1 x ($279.99) CPU INTEL|CORE I7 920 2.66G 45N R - Retail $279.99 (going with stock intel fan should be decent for oc with good airflow in case usually up to 10pct i believe i could be wrong, i dont really oc much so wouldnt know details)
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1 x ($-62.00) DISCOUNT FOR COMBO #216527$-62.00
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1 x ($-19.99) DISCOUNT FOR COMBO #216527 GIFT$-19.99
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total 691 - subtrace 70 dollars from case = 621 (shipping is like $20) puts you at 641
Decent vidcar 120 bucks = 760$

Thermal Take/BFG 550 Watts Modular Powe Supply around $50 (good enough to run gtx 260, ati 4870,4890 (no crossfire or sli)
Cost = 810 Decent Hard Drive and Dvd rom about 100 bucks from ebay or new egg $910 without OS.

with os oem windows vista home/ xp will be around $1000

if u go with mediocre mobo and 3gb ram and so so case u can cut another 100-150 bucks so 850+ u can have a decent i7 system

If you don't have 1200 for a decent I7 build just wait till you DO. Skimping is not worth it IMO

You can't be serious... A Phenom II system would allow better RAM, a large hard drive, and/or better graphics cards. A sub $1000 i7 system is stupid, pure and simple.