Sadly I7 is nice to brag about but the results are not worth it till games have FULL quad-support not the half-ass support it currently has (example GTA4)
Also note he wont tell you WHAT the parts # are this is very bad imo...if they don't tell you then be assured its most likely not the best. Could be a Deathstar or Hitachi 5 minute drive...a junkie X58 board.
Unless he will give you detailed specs id build your own I7 or try the one below.
A system I built for my father is this last few weeks.
Processor
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103650
Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128378
Memory
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231189
Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
HDD (badass drives 2 RAID0 = 360mb burst rate 1 = 180mb or so)
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148395
Case (I love these cases bought 4 for $60 last year free shipping)
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021
CPU Cooler Your call...I used a Xigmatek S1283 because the Antec 900 has a top fan.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835233003&Tpk=Xigmatek%20S1283
GPU GTX 260
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150330
OR if you like ATI
ATI 4890 1GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150360
Total price = $877.14 after rebates = $822.14 with the Nvidia card.
With ATI
Total price = $898.23 after rebates = 843.23 with the ATI card.
You can also SLI later on when prices drop. Though I would choose a better motherboard if you want to SLI. Wont hinder the card a lot but it will a bit.
I overclocked the PII to 3.4ghz and I overclocked the GTX 260 216 core and his settings on WoW with a 32 inch LCD are 40+ FPS. Which is impressive since WoW has a leak in their new Engine.
I dare say it might be better then my Q6600 system.
You can also pay a bit more for a better board for SLI and get 2 GTX 260s and overclock both. I have ran a GTX 295 on my TX750w without issues with my Q6600 @ 3.6ghz. I run about 640w on average load and STILL pay less then then I7 build
I personally wont have to upgrade till next year or longer...even when quads become normal will be a LONG time before a 3.0ghz+ quad is "useless"