ok ice .... I think you will find most of the stuff you find in oz being called ice is large rocks of crystal meth not 4-MA (4-methylaminorex right?).
Uncut crystal is very expensive as you have said, anywhere from 400 - 600 a g. But with rocks like this dealers can crush them down, then cut the crap out of it and sell it, it still gives a better rush than average grade wizz, and the dealer makes a killing.
Though it is smokable, you'll find very few people do, it gives a very intense rush, but it's also short in duration.
more common is to either inject it, or to crush it down and cut it with something like glucose etc (many threads on cutting I'm sure)
One of the few good things about livin in perth as far as drugs go is that we have a good supply of high grade crystal, generally accredited to our large bikie population.
As far as the overall feel goes, i find it's like wizz, but with a harder rush, much more clear headed (i.e. can focus more) & less jittery, with a longer period before the rush subsides.
This stuff is also more addictive, in perth there is alot more people who use crystal every day than use wizz daily i would speculate, most of them start on wizz, but once they find a good supply of quality crystal, they don't look back. But since you're a bluelighter, I trust you have the intelligence to be careful with it.
As far as the injecting debate goes, I realise that injecting is a valid method of taking stuff, I am against it though due to the increased addiction potential of IV drug use.
Think I'll stop now, before you all fall asleep hehehe