BMW MINI alterator

[crankedup5]

The alternator on our BMW mini cooper 2009 model is giving up and needs to be replaced soon.
I have looked at Europarts for the replacement and they offer two differing amp outputs.
150amp at a cost of £450
120amp at cost of £260.

Both alternators are RTX brand. My question is can I get by on the 120amp output?
Our car is standard as factory with A/C.
Thanks.

[crankedup5]

Thanks scrump, and I had overlooked the discount code.

[crankedup5]

^^^^^^^^
Thanks, last thing I would want to do is a alternator swop more then once on a mini!!