Building 1st Computer Opinions Needed!

I'm building my very first system and I have the follow parts so far:

Soyo Dragon Platnium

Western Digital Special Edition Hard Drive with 8 MB Buffer

What I'm planning on getting tomorrow are:

Antec Full Tower Case with 300 Watt Power Supply

512 Stick of DDR 2700 RAM

AMD XP 1.7, 1.8, 1.9, or 2.0 Processor

What I want to know is, since AMD CPU's are good at over clocking if i should just get a 1.7 XP and use the money I saved to invest in some rounded cables and some good fans. I'm pretty much using this system for games only but I don't want to have to keep upgrading the CPU so should I just buy the best I can afford now or should I get a lower end and just overclock it when I need to? Will 1.8 still run any game on the market at the highest setting or does that pretty much depend on the videocard?

Also I was wondering will 300 Watts be enough for a CD-RW, DVD-ROM, and 1 Hard Drive, and a video card or should I go to the 400 Watt?

Any help would be great! Thanks in advance!

<P ID="edit"><FONT SIZE=-1><EM>Edited by Niko1337 on 07/05/02 06:05 AM.</EM></FONT></P>

What I'm decideing to do is slightly different...

I'm getting a Asus P4S533 Motherboard (533 Mhz Bus)
2.2 Ghz 533 processor
512 Meg 2700 DDR Ram
80 Gig 7200 RPM Drive
MSI Gforce 4 TI4400 Video Card
19" Monitor (Trying to land Black Components still)
CD Rom, Burner, etc
Audigy Xgamer Sound Gard
Logitech Optical Cordless Mouse and Keyboard
and a nice set of speakers either Megaworks 510D or Inspire 5700
This is going in a case with a 350 Watt power supply which I've been told will be fine, but I would like to move to a 400 Watt if possible...

I would go with a 2.0A northwood but I want a 533 CPU to get the full effect of the Asus Motherboard and the 2700 Ram on a 533 FSB..

Just my thoughts, any critism would be appreciated as it will only help my future purchase.

Thanks,
Vince