Personally, I prefer PCs. My vendor of choice “for now” is Bold Data Systems (https://www.boldata.com/catalog.cfm/page/wks_Intel). Their machines are well built and well priced. Support from these guys is awesome (1 Year Premium On-Site Warranty with 24/7 Technical Support).
“i heard that macs can use unlimited ram where as PC can only do 2g, is this true?”
Nope, you have to run a 64 bit OS like XP 64, but you can use more than 2 GB of ram. I’ve been using 8+ gigs of ram on Windows OS’s for years and have had no issues related having too much of it. 🙂
In the end it boils down to personal preference. I use Adobe’s CS3 Production Bundle with Cinema 4D and I have very few issues related to Windows. Your mileage may vary.
Thanks,
Shawn