In Europe, the majority of potential employers that require a type rating are 737 operators.
However, if you are willing to fund a type rating, you'd be better off securing an offer of employment to go with it.
easyJet, Ryanair (last resort!!), Jet2 and BMI Baby all run schemes where you are offered employment on the basis of funding the type rating.
Astraeus also run a type + line training deal which MIGHT lead to employment if you do the right thing.