Luckily, I recently upgraded to PS CS6. I wanted to get the last of the non-cloud PS as it should have most of the abilities that I'll ever need. Haven't had time to work on a stitched image yet, but I'll let you know how it goes.
BTW, I'm up in the hills, but will catch up with you one day for a beer/coffee/Urbal tea! Again, thanks for the offer!