Take the A320 rating and wait for a command there. If it's Doha, then their expansion means you won't have to wait more than a few years (IMHO). Staying on the 145 is backing yourself into a cul-de-sac in aviation terms. As you can see yourself, there is no natural progression from the LHS of a 145 these days.
I would also resist the urge to move onto heavy metal while out in the sand pit. It does wonders for you're ego, but it means you end up with a useless type if your plan is to come back to europe. Most 777 or 330 operators in europe are large legacy carriers with a very long seniority list.
Have a game plan if you're heading to the sand pit. Do your time, save your money, kiss derriere and get a 320 command. 5 years tops and then head home. Should see you about right.