6 of one 1/2 dozen of the other, you have quite afew options which will really depend on
1. budget. (under 3k and up)
2. size/type of models you want to fly
3. flying club field type/conditions
4. ARF or built up kits?

Re- Turbine purchase cost and also long term ownership including service interval costs need to be considered closely and compared between manufacturers as some manufacturers suggest expensive repairs that may include bearing and combustion chamber replacement every 25 hrs of operation which can equal very expensive repair bills... other turbine manufacturers list 50 -100 hrs between major service intervals. Do the math and you will see a big difference in costs... compare specifications between all turbines also for good insight as to performance of each engine. Consider operating temperatures, throttle response, fuel efficiency, service locations and again real service costs.

Re- Kits depending on above mentioned factors- Kangaroo, Rookie, AV8R, Facet, Cermark MB339 are well proven entry models for MW-54 sized turbines, there are others also but generally suited to larger sized engines....

Hope this helps