I would suggest to following :
If you have a good rebuilder or are handy yourself, it may be worth to refurbish the alternator yourself. You should however do a thorough check on what exactly is wrong. Also look at the price difference between getting the parts (bearings/brushes etc.) and a refurbished or new alternator. Sometimes you get lucky and find a cheap new one on the bay (KP found the complete fuel pump systems for an SC for 50 GBP for me, much better than the usual 400 GBP).
When you are at it, definitely do the water pump as I believe they are a weak point on the BMW V8 (please correct me if I'm wrong here).
Belt replacement definitely, unless the current one is only a few days/weeks old.
Tension roller and tensioner itself is one I usually do when I do the belt (assuming the belt has done a fair bit of hours with the roller etc.) The bearing on the roller is not a superstrong point and they tend to fail sometimes. The money isn't worth the risk to me. MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!
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