Unfortunately the CPA is quite rare in the UK so the price differential is considerable, even if you can find one. I've used a CPE-2 for about a year with the 25xx series tanks and spirals for 4x5 and 120. The 120/35mm reels are a pain to load compared to Paterson reels IMO but despite some initial awkwardness, the 4x5 reels are OK once you get used to them...

I would suggest you get the version with a lift if you can as it makes dumping and filling faster, and more controlled so you can keep times more consistent. I got my lift from a CPE-2 with a dead motor and it is a real improvement. You can buy the cog lids needed for use with a lift from Jobo.

Just don't believe the temperature markings on the dial - use a thermometer and mark it yourelf with a permanent ink pen at the temperature required...

Cheers, Bob.