If i was to model in OO again i would choose LIMA, some may laugh, simply because with these models you can do a lot to them to make them even better than Bachmann, its fun to do as well, you can make them your own and at a much lower cost, ie, replacing motors/adding extra detail etc. i made a thread about this im on a mission to get the best locos lima made like the excellent class 31 for example and make them run as smooth as silk, also you have a lot of room to work with in these locos meaning you can install very complicated lighting and huge DCC sound speakers, in turn i get much more satisfaction from this hobby doing things this way.
But it doesn't stop there, you can even fit two motors to the larger locos, in turn this gives a huge amount torque when pulling things like real coal/gravel. i love the idea of this and this is going to be my next venture in this hobby. to be honest for the sake of about 30 quid you can make them look bloody amazing.