If you do get an Ion, do yourself a favour and visit the Ion forum on PBNation. Have a read of the stickies before you even take it out of the box and you'll avoid most of the 'user error' problems right there.
I'd recommend a look at the new electronic Trilogy series as well; I'm just testing one new and it's actually very nice. The top end model comes with two different bore barrel backs and retails in the US at around $300, not bad for an e-cocker with break beam eyes
If not, then take a look on the forums- Matrixes for £150, cockers for £200 etc etc.