Make sure it has the GR-2 kit.
Ask if it has the Geo Soft Touch kit (GST), you will want to get this if they are not including in sale. It's the only 'real' upgrade to the Geo. You could get a custom trigger, which is all personal preference. It should shoot just like your friends Geo as long as you get the GST, assuming he has the GST also.
Only one generation atm, the Geo+ (a geo with GR-2 and GST stock and more anno colors) and the Geo2 are due out soon.
This will be a buy you will not regret