Thanks guys for the feedback.
I could keep Morison and upgrade Senderos to Evans right now as I have 0.7 in the bank, but surely Evans will be rotated with Ferdinand, Smalling and Jones. I think Evans will get games, just a bit of uncertainty how many. I may yet pick him.
Vermaelen, well... he's a risk CS wise I agree and I'd be the first to admit that as an Arsenal fan. At the same time, Sagna should be back quite soon. He'll get his share of 2's like other defenders but unlike other defenders imo, has the potential to score big. If I didn't go with him, not sure who would be a better pick. Clichy's played 90 mins 15/22 GW's, decent I guess. Thing is, I'd only downgrade to Clichy if that extra cash would come in use, and at the moment I don't see where it would make a massive improvement.
If not Caulker, someone like Shotton? I may yet go Vorm

Mignolet but I'm wary because Mignolet could quickly lose out to Westwood or Gordon, who is back soon. I doubt I'd play Caulker much, just rotating with Senderos or Simpson depending who's got the best fixture that week.
What do people think of Cahill? Is he likely to start most games? I'll probably wait a couple of weeks after the WC to be certain unless AVB has stated his intentions with him.