I would not recommend the Trex... It is more expensive...
My first heli was the CP Pro.. It is totally modded now and I still love flying this little gem...
Forward flight inside a gym is a blast... Stall turns, fast 8's, it is a blast for sure...
Just buy what your LHS supports and has plenty of parts for...
Learn to hover and FF and then you'll be ready for a Trex...