I like this discussion,, something I've looked at a few times and never went with anything cause I couldn't decide, but here is one to consider, I've spoken to the guy who owns this and he is selling a good few.

http://www.eztrack.ie/

I just dont want to get into a monthy recurring cost for a tracker when you can do it yourself for no additional cost other than to top up the sim card maybe every few months.They have come down so much in cost in recent years.