You dont have to take a 737 position. You can say you want airbus and you will just be bonded for the rating, that said if you are 73 rated I should imagine they will want to get you on that. Las tI heard they only need 70 more guys this round so I am not sure quite how much barganing power you get, but you wont know unless you go.
Bank on a reasonable house for a family of 2 costing all in bills circa £1000. Take home around £3-3300 on an average month, less on leave. More if you are based in europe where the tax situation is still in force.
Hope this helps.