[Soukup]

ah ha...that's why its lagging.

If I am correct I think that you are barely making it over that reguirements for max 4. If you have some money upgrade the ram and processor, and the video card as welll, (all though that won't make a real difference in animation) The reason you are getting so much lag is that why your models are pretty normal, your computer can't handle it. If you were to upgrade to 512 ddr, you wouldn't have any problem.

Just for you to compare

one computer had
384 mb sd ram
300 mhz
4 gb hard drive (2 scuzzis)

worked great for early modeling but after about 5000 polygons, we had major lag

My computer had
512 ddr dram
2x dual athlon 2000 mp's (1.7 ghz)
ge force 4 ti4200 video card
40 gb hard drive

I was able to move without lagging through scenes of 2 million polygons, with no problems. Upgrading your computer is your first step, and you'll be very happy with your investment.