I use SAS/C 6.58 a lot and find it really good.
Once you get used to the GUI, it's quick and easy to use.
The debugger works well too.
It'd be worth buying a 2nd hand copy which has the printed manuals. I find the function library documentation essential.
Would be beyond a bog standard A500 to run the SAS/C package, but you can certainly compile apps for the A500 using a higher spec machine.
Of course there are a bunch of other compilers including GCC (freeware?) and Storm C (from H&P). Most of the compilers available would probably do the job OK.
