What engine do you all reccomend on an LT40! My choices at the moment are: (feel free to add!)

TT GP42
TT Pro 46
Mag XLS 40
Mag XLS 46
Mag XLS 52
GMS 47
OS 46FX

I'm thinking that the XLS 40 is probably the smallest I want to go for an LT40? Money is somewhat of an issue as a OS 52 isn't an option. I will be taking off from a grass flying field. I'm also at about 2200 feet sea level in Spokane WA. Would a TT GP42 be strong enough or will I be wishing I had a more powerful engine. Moving the engine to another plane isn't something I'm going to do. I'm going to keep a trainer flying all the time. Reliability, parts availability and manufactures support are also issues. Mag, TT and GMS all seem to be a let down in some of those areas. I can't even find a manufacturing website for GMS or Magnum. That concerns me.. Let me know what I should get! Thanks! Chad