I would also add doing a google search on prices to your list of checks. Steam often isnt the cheapest provider out there, although with a £10 limit, the difference may not be worth worrying about.

Incidently I have the same strategy. I will only get the games I want to play after they have been out for a while as there is always a queue of things in my to play box that will keep me entertained until the games are cheap and include all the add ons in the price.