dont worry 2 much. i know someone who only put 1 choice down, and they got into that!
i listed all of them but because i chose talybont south, i got in (it holds the most students so u normally have a good chance of getting in). i dont know anyone who got their second choice let alone 3rd or 4th. just send your form in quicky and dont contemplate too much. although i do recommend talybont south!!!!! definately!!