You may not realize it, but you have contacted a forum sponsored by an American model railroad magazine publisher and by mostly US based train manufacturers. Most of the participants here will have very little knowledge about the products you seek to buy except for those formerly made by Mike's Train House (MTH).
At one time, MTH made some European model trains in O gauge (American), but they have changed their business model and have not manufactured any such models in some time. Search the second-hand markets and you might find something available.
As to quality of models, there are three prime factors, mechanical, electronic and scale fidelity. On the electronic end, many here who own MTH products are now a little worried because MTH used a system that only they developed and made, so if something goes bad, you may have to install a brand new system made by somebody else. On the mechanical side, most of their products are made well, but there can be some major differences in that opinion with certain products. Similarly, scale fidelity can vary from piece to piece, but I think most European models were good representations of their prototypes.
Chuck
