to be honest get the xe. it has the bolt out back already and works a treat. The only thing about owning an ion (me one of them well used too) is you spend a poo load of hard earned cash when for example you can buy an invert mini and it is so much well erm nicer im my opinion for the cost of just some of the upgrades.....
ie the board in an ion isnt well takes forever to set the bps and doesnt have ramping mode so if you wana play tournys you need a new boards, if not then great.
before im ramble on what type of paintball you playin woodsball or tourny?