More ram always better especially for photoshop
just bought a 512MB Kingston PC2100 DDR at $110+ (or even cheaper if u buy whole system)
256MB should be abt $57+
my advise is better get as much as u need before u regret like i did.....past experience & insider info tell me that ram price will not always stays so cheap....it is already cheap enough liao so it will not get cheaper anymore.
the last time when ram prices were this cheap was in Oct 2001. I regretted not buying 1GB of ram at that time cos the next day the prices were tripled and never go down anymore until now.
BUY BUY BUY