I feel for you, I'm in the middle of doing my bike also, it all started with a leaky rear tranny seal but the parts list kept getting longer as I decided to go all the way to the rear main seal and have a good look at the clutch. My clutch O-Ring wasn't leaking but certainly showed signs of degradation at 43,000 Km, may have lasted another 20,000 or so, but I plan on more milleage than that next summer, so it may have left me stranded away from home and costed me a clutch also.
All in all not too difficult of a job but for the fact that I kept switching tools too often for my liking, not as standardized as my previous BMWs. All I used to dismantle was the BMW shop manual, but will have the Clymer also for reassembly. I don't think I would have needed it, but wanted it for the wiring diagrams.
The clutch slave cylinder is a lot cheaper at BeemerBoneyard, and the link on E-Bay I posted earlier is still listing all them clutch parts, brand new OEM.
You can probably leave the alternator alone,is there even a seal there? But clean the starter, mine had quite a bit of dust in it, too much and you may get some strange electrical gremlins.
I am replacing all the tranny seals, they don't cost much for peace of mind, but I also have to do the front seal on the rear drive, I had a bad driveshaft that probably caused it to fail altogether with the tranny seal.That rear drive seal requires special tools so I took the drive to the shop for that, and left the tranny with them also for the seals.
But the tranny seals are easy enough to do yourself, I only left mine at the shop for convenience and the fact that they owe me money.....!
Talking driveshaft, do not ignore "Phasing"the driveshaft on reassembly, that is lining up the U-Joints,not mentioned in the BMW shop manual......! Someone was inside my bike before me, I am not the original owner, and I found quite a few screw-ups, one of them the driveshaft not phased which probably caused it to fail.
I'd certainly suggest the Clymer because of the photos, but you can get the BMW manual for less than $10.00 online, errors included....!
P.S. Your signature...fits right into our day here today, but could end in "so old" instead!