Build Upgrading Help

OK right now i have:

AMD Athlon 64 3500+
ASUS A8N-SLI
3gb Ram DDR
ATI Radeon X800
420 watt power supply
1x200 GB
1x300 GB
Sony Dvd/Cdrw drive
Sony 17 inch LCD

I want to buy new pieces and i am wonder what i should change and what i should just keep and what are your recommendations. Buget is not too important just nothing completely outrageous

the only thing you could do with that without sarting fresh would be a cheap ($100 or less) graphics card upgrade. you might find an opteron 165 or another dual core floating, but I wouldn't spend even $50 on one. anything more, and you'd be better off putting toward a new system.

your HDDs and LCD could be carried over, but they have been improved apon quite a bit too.

your optical is fine, but a new one is so cheap, you might as well get a Sata DVD burner while your at it.

CPU - $180-$250
e8400/e8500 or q6600/q9450 (Duo core will be just fine, but quad core has some benefits. The Duo core will generally be better at gaming, but the choice is up to you)

CPU HSF - $45 + $14 retention bracket = $59 I'm assuming your going to OC sometime in the future, otherwise the stock CPU HSF will do, which won't cost you anything extra.
Xigmatek s1283 w/RETENTION BRACKET!!

Mobo - $100-250 depending on which one you get!
p45/x38/x48 mobo (depending on upgrade plans and OC'ing)

Memory - $40-80 This is also dependant on if you OC mildly or extremely.
2x2gb's of DDR2 800mHz (minimal)

GPU - $130 (1x4850) - $320 (2x4850's or about $250-300 for 1x4870)
4870 or 2x4850's depending on LCD upgrade. A 4850 will do just fine for you 17" LCD, but if you go up to a 22-24" LCD the 4870 or 2x4850's will do just fine.

Case - $85 for Antec or $78 for Cooler Master
Antec 900/Cooler Master 690

PSU - $84 after $20 MIR.
Corsair 750tx!!

DVD Burner - $25 - $35 depending on brand or whether its OEM or Retail.
I like LiteOn burners, since I've had ZERO issues with them. There are plenty out there that a good too.

Now I listed these in USD, so if you have a site that you shop from let us know what it is, so we can see what options/prices you are dealing with.

So what is your final build looking like??