From the photo I would say there is plenty of room on the drop outs. 600 quid sounds like a a lot of money to me but I don't know what spec you are planning on. Bear in mind a bike from mercian is prob more stealable than a bike with Condor. IMO. Any of those other bikes would be fine. Try them out at a shop and see if you like them.
That is going to be your run around! Wow.
From the photo I would say there is plenty of room on the drop outs. 600 quid sounds like a a lot of money to me but I don't know what spec you are planning on. Bear in mind a bike from mercian is prob more stealable than a bike with Condor. IMO. Any of those other bikes would be fine. Try them out at a shop and see if you like them.