Sorry for the long rant, now to the questions:
a) Is it worth it for me to switch to PCI-Ex of that price range? Will the performance be noticable? If Yes: What card do you recommend in that price range?
b) What MB do you recommend for me within that price range?
c) Does the Dual Channel RAM work with all 939MB's and all types of RAM?
d) What if I leave the RAM I have now for a bit?
e) (To someone who has personal experience upgrading from 512mb to 1024mb) Is it worth it? Is this smoothness or just faster loading?
f) Will my 300W power Supply handle this?
Thank you very, very much for any help that you can provide to a very confused guy that is having nightmares deciding what to buy!!!
Vic
Edit: Added power supply info.
A) Depends on the card you buy. For 130, you can't really get a good card. I'd recommend getting a 6600gt which is about 180, but let me tell you, thats the sweet spot. Best performence for that price. Can't be beat. And if you do buy a 6600 gt, the performence increase from agp 4x (and your curren card) to pci-e with 6600 gt is huge!!!
B) I'd recommend a asus socket 939 mobo. Preferably a nforce4 chipset.
C) no, not all. But nforce4 certainly does and a lot more too. I'd seriously consider getting this mobo as I've never had any trouble with it. Like dan said, you might want to spend a little morre on the mobo.
D) Not a good idea. It'll hold back your system. Consider getting some higher quality DDR400 ram. OCZ or Corsair is good.
E) 1 gig is currently the sweet spot for gaming. More than 1 gig for the averge person is unecessary and less could increase loading times and hamper performence a bit.
F) technically yes, but except problems like random reboots and possbily hardware damage. Practically, no. Get atleast a 400 watt PSU. I recommend thermaltake or antec. These companies actually post the real wattage on their packaging. Cheapo companies report 500 watts on their boxes except the PSU can really only handle 200 watts. The PSU is also a good place to spend a little extra to make sure the rest of your comp doesn't get screwed.