As a general rule strobes, unlike housings/cameras, can move with you to a new system. That's why I've consistently advocated to get the best strobe that you can afford to buy.
This may, may, not work if you're going from a P&S to a dSLR but otherwise it mostly does.
Then again there are always those who want the "latest and best" - not necessarily - and that's where bargains are to be had on the likes of eBay.
Cheers,
Christian
There is nothing more certain in life than taxes, decompression theory and death - CG