Might be a bit late Graham... but if not, some advice from someone who has been through a few dive computers...
Just get a Sunnto Gecko or Vyper - not expensive, bullet proof and the BIG plus point is that 90% of the divers you'll dive with will use one - the benefit? You'll all be diving off the same deco algorthim - in my experiance the Aladin's are pretty generous, so you'll oftenm have 5 mins no stop time left wilst others are heading up.
The PC function to most is a gimick IMO, all you really need is depth, no stop time, maybe temp and total dive time. Unless you are deco diving, or using mixed gases the Tec 2G is an over kill.
I use one, for the tec diving I do - as it suits what I need, but the buttons are small and fiddly, the screen scratches easily and the battery life poor - not like the chunky Suunto.
Just my 5p worth.
Adam