Hi Colin,
Just a few thoughts re your bike plans. You have already described yourself as the more sedate(mature?) type of rider-sounds like me. Im 64 & have done all the "been there done that" type of stuff & Im happy to enjoy the rest of lifes journey @ speeds where my eyes can remain focussed on my surroundings & within the limitations of a somewhat abused body!
You probably wont be going anywhere near expl oring the limits so a refresh of suspension ie change of fork oil and get the settings right for your weight etc. Some members go for the full monty F&R but unless your rear suspension is shot theres prob no point going for anything more exotic but members like DevilsYam are the ones to talk to re upgrades.
Brakes: Hel or Goodridge available everywhere. I prefer the twin line front system -one hose running to each calliper from master cylinder. Rear one single line so set of 3 bike specific hoses approx cost £75, and specify chrome or s/less steel banjos NOT alloy.
No need to change master cylinders unless troublesome-just purchase the master cylinder overhaul kits(pref YAMAHA) and the brake calliper seal kits-I prefer YAMAHA because although dearer than pattern parts THEY ALWAYS FIT FIRST TIME! While doingall this strip & clean brake callipers check pads, clean support pins, piston seal grooves and lube new seals/piston with red rubber brake grease. Copper grease back of brake pads SPARINGLY also support pins and anti-rattle shims.
For all electrical connections I use electrical contact cleaner spray & ACF for all year round protection. GT85 is a good general cleaning/lubricating spray & smells better burning off a warmiing engine!
Cables=unless frayed/damaged/corroded-use a pressure lubricator attachment-about £7 from bike shop
Scotoiler should prolong life of chain & sprocketscheck articles elsewhere on forum
Tyres-personal preference here. Bridgestones good as any for most purposes.
My own starting point would be a thorough deep clean of bike-but I never use pressure washers-sinceI saw what they can do to van paintwork!
Points re comfort-seat bar risers talk to others for advice
Finally modest tune up-carb balancing and idler speed Air & fuel filter OK-Go ride it!