I think about to buy the UBC 10-R belt grinder from suhner.
www.suhner.com
There is also some auxiliary equipment available, like different trolley poles. The belts are available from suhner too, or as baz said.
The UBC is expensive, but i think i need a new toy to get faster and to get forward.
I thought about air tools some time ago. But i didnt have enough space for setting up a big compressor. And there is also the noise that it makes. I think my neighbours would kill me...