if you can get a decent discount on particle illusion you should really go for it. particle ilusion is stupidly powerfull when you get into the nuts and bolts of it, from waterfalls to exploding galaxy's, you can with particle illusion. using the timeline to control every aspect of emitters and super-emitters and particles. particle illusion is an addiction in itself once you get started. Add into that the compositing features and you have yourself one mean particle system indeed. everything else is pretty much a cut down version of this app and not in the same class, and it'll love your monster 'puter for realtime previews.
particle illusion is something you'll love playing with, period.
Ohd Chinese Ploverb say : Wise Eskimo, not eat yerrow snow.