please advise which battery for C180 v reg

[philepo]

The battery in my estate car is a big 780 amp / 88 A/hr beast. Its on its last legs so am looking for an ECONOMICAL replacement! I was quoted £69 for a silver Bosch with 640 amp / 60 A/hr which sounds good. So my question is is it OK to go down to this spec?
I don't do any camping or use the lighter sockets for power...

 

[philepo]

bought exact replacement for £83 in the end - battery solutions, york