Video Card..

I'm in the process of purchasing parts for a new Windows XP home edition 
32 bit operating system based computer.

I'm an amateur photographer but I use CS3 which is a memory/processor 
hog on my current computer so I'd like to optimize my new computer for 
CS3. On my current XP system I have 2GB of ram, an AMD 1.45GHz single 
core processor and 128 MB of Video Ram and CS3 can be a little 
"sluggish" at times. Currently, under Preferences, Performance, I have 
1603MB of Available RAM and I'm letting CS3 use 1202MB which is 75% of 
the Available RAM. I currently have the Scratch Disk set on a different 
partition on my one hard drive. I have the History States set at 10 and 
the Cache Levels set at 6.

I'm going to use an AMD 2.8 GHz dual core processor but there is a 
question as to how much RAM. 32 bit operating systems can only address 
4GB of memory so the more RAM on my video card the less memory address 
for the system RAM.

I planned to install 4GB of dual layer RAM, which the new motherboard 
sup****ts, and a 1GB video card. Because of the OS memory address limit 
of 4GB, I'm only going to be able to address 3GB or less of the system 
memory because of the 1GB on the video card.

I'm not a gamer. Is CS3 going to really benefit from having a video card 
with 1GB of ram or can I go with either 256MB or 512MB of RAM on the 
video card?

I also plan to have two hard drives so I can put the CS3 scratch disk on 
the second hard drive and use that drive for photo and data storage.

-- 
  JD..