Your friend.... Uh. (Darn forum rules) Anyways your friend is so wrong I had to refrain from using certain phrases to describe him.
Unless you modify Parts for overclocking or Build the case from scratch, there is no Soddering...
What parts do you want to reuse if Any?
Ill just do a Quick Non Link Build
E6400 - $218 ish
Gigabyte DS3 Board - $135 ish
2 GB Low Latency RAM, Mmm probably OCZ - $280+ ish
250/320GB SATA HD w/16 MB Cache - $100 ish
Samsung/optorite/Plextor DVD/CD Burner (/ indicates or) - $50+ ish
TT Big Typhoon or Zalman 9700 or XP-120 w/ artic Silver 5 - $50 ish
A reliable < 600 Watt PSU (Enermax Antec Hiper Type R SilverStone Seasonic, etc.) - 100 ish
Sound card (A cheap but still good is audigy 2 ZS) - <$70 ish
ATI x1900xt/Nvidia 7950GT (Or whatever, I don't really know all the video card Models) - $280ish
Some NIce Big case. - $80+ ish
Course this is just an outline, it sitll needs alot of tweaking depending on EXACT prices and parts youll be using. If youll Notice I didn't Include, Moniter, speakers, Mouse, Keyboard or any other addon.