Nothing wrong with nitros.....I am impressed by the new li Po battery technology......I have got a small indoor heli with this type of battery....I am getting 12 minutes or so of flight time on a 800 mah battery!! an hour and a half later its charged up ready to go again....so the TRex is feasable....parts are fairly cheap (its going to get broken sometime)
Nitros are ok....I started out with a Nexus 30 and now fly a Century Hawk....which is a great heli...very cheap and quite capable of stunts etc as you get more advanced.
I have a Sceadu 30 but havent flown it as it needs kitting out with engine etc. Folk say the sceadu is a superb machine....the 50 size is meant to be better.
Century make 50 size helis....and they are meant to be very good.
30 size or 50 size....doesnt matter......the 30 size machines seem stable enough.....50 size is ok for a beginner...why not? at least you wont have to upgrade....and you should have plenty of power.
Electric is good if Nitro fuel is hard to get.....I am seriously looking at going electric as nitro is a pain to find.....but I enjoy nitro.....ah heck!!!!! I like them all....electric and nitro
Simulator? try Realflight G3 ....its quite expensive but with the included 'transmitter' it saves a lot of trouble messing around trying to find a spare radio to use it.....the graphics are cool.....and the options are very very good. Its well worth the money.....sim time is important.....it will help you learn the basics.....right through to advanced flying.......if thats what you want.
Rob