Biased I know (I work there) but BAE Systems at Jerez can do you a good MCC (as chosen by BA and Aer Lingus - neither of whom want it done at OATS!).
Jet sim IS better than turbo prop as the handling characterisitics are different and the jet handling skills learnt will stand you in good stead when you go for that interview where the selection is BOUND to be flown on a 737 sim!
ATP are good, too, if you don't fancy the travelling