Which Linux distro / hardware combo is a reasonable choice?

[John Clayton]

to reply - please replace notmac with mac in my address above.

My question is this:  I wish to port an objective-c, non-gui app from 
Mac OS X to GNUstep - is there a particular hardware platform / Linux 
flavour combination that is  better than others?

I.e. any old PC using Slackware is better than a power-pc based Linux distro?

I'm simply trying to find the most reliable / supported solution before 
I begin development.

Thanks

John Clayton