BlitzMAX ... doesn't work reliably on computers that are more than 5 years old
Huh? Sorry for going off topic here, but I've tested BMax programs on more than a
dozen old setups(as old as 1998). I've never had any glitches or difficulties
at all. What are you talking about?
But back on topic: don't hold your breath for Vista and the standardization of DX10.
You'll be waiting so long, you'll be considering buying the next next Total War game.
Just get the best deal you can right now. It doesn't matter when you buy, the
curve is constant and your machine will be just as "crappy" 5 years after you buy it.
This whole "Waiting for technology to advance before I buy" thing is futile and useless.