hi SC
Forget ATR or 737... if you are going to spend any money on a type-rating it should be on the A320 series. Airbus now accounts for the vast majority of new aircraft deliveries, esp. with low-cost carriers, not just in Europe but also in the USA and Far East.
Read this weeks Flight International. Also check out the A320 thread on this forum.
How's the sandpit?
ps are you in touch with Gerund?