Nick,
Having now flown for both TOM and TCX I would say expect very little stability in the charter market. As soon as the economy or political issues flare up you will have management banging on about Pilot surplus and most winters wanting to reduce the establishment. They are also trying to address these summer/winter imbalances and really don't want any permenant full timers. Of course if you get in during expansion and ride your time at the bottom of a list you will have a very enjoyable career.
Historically Midland bases are very difficult to come by so expect to spend a few years else where before you get your base bid