The best ones have the windbar that makes life easier.
( Airtour over Pooleys any day )
When I started out we were always advised to go for a CRP-5 just in case the flight bug well and truley bit & you wanted to proceed up the training ladder.
Saves buying two CRP's in the long run. Also found the CRP "5's" feel more robust.
£90 upwards can be hard to swallow for a device that drives you mad but if you don't mind little used ones then ebay always has some aournd £30 or less.
crp 5 flight | eBay
Cheers