Computer Upgrade Questions

[Nucholza]

So I'm looking into possibly making some hardware upgrades, but if I do I need to stay really cheap (like $300 or lower) so here's what I found:

Mobo: http://www.newegg.com/Product/Produc...82E16813130228

CPU: http://www.newegg.com/Product/Produc...82E16819103649

RAM: http://www.newegg.com/Product/Produc...82E16820220347

Total Cost = $265

my current stuff is:

Mobo: (Asus website acting up so can't link) Asus Crosshair (1st gen, not Crosshair II or III)

CPU: Athlon 64 x2 6400+ (~3.2 ghz dual core)

RAM: 2 sticks of 2 GB DDR2 800

My main questions are

A) The mobo seems too good to be true for that price, but it looks just fine to me at least

B) I'm not too sure what it will be like going from dual-core 3.2ghz to triple-core 2.8 ghz will be like....am I going to see things go slower? Or will it just be something like XP will seem slower but windows 7 will be a ton better - really not sure on all that junk.

C) Would it be smarter to spend another $20 or so to get 3 sticks of 2 GB RAM for a total of 6 GB for windows 7 and run it in triple channel (but I don't think the mobo supports that). I guess I'd plan on keeping this setup roughly 2 years so am I wrong in assuming that this mobo and 4 GB in dual channel would be good enough?

D) Am I missing something I'd need to upgrade? My PSU is 700W so I don't think that would need an upgrade and I plan on just using the same case. Onion is a doll and is sending me a video card of his that should (fingers crossed) resolve my gay issues needing to restart my game over and over during raids.

And if you can find something better than I did for roughly the same price feel free to point me in that direction >.>