I use(d) the miniatures very much for our game sessions.
I bought lots of from ironwind and ebay over the last years.
You can get minis from ralpartha and grenadier. I like the ralpartha more, because they have more details, in my opinion.
Iīm playing SR for more than 15 years now, but since I mastered DnD3E I like the idea of using minis in any system. Itīs much easier to show strategic situations, moveactions and so on.
I use the old DMZ maps quite often, howerver they do not have the perfect scale match, but they work.
for other situations I draw the situations on coated paper with whiteboard pens. that is easy going and fast forward
for vehicles I take everything I can get. Warhammer 40k and other models
cheers
Lupus