"The capstan shaft doesn't look shiny (at least it doesn't look shinier where the tape hits it)."
That's good news.
As to spares, well I agree with Steve's good advice, but I would be tempted to get a spare pinch roller too. These parts along with the capstan motor are your time base and can most particularly affect wow & flutter performance. It is my understanding that erase heads generally wear out slower than record/playback heads do. Better P/R heads may well be available in the future. Thus I could wait on those assuming your present heads are fine (couldn't tell from your posted photo). The VR card is a mystry to me and requires more investigation. My first guess was that VR is voltage regulator, but if this is a card with lots of pots on it, that suggests bias and eq control. Given that your machine is shaping-up as being a low milage deck I'd be more concerned with saving the $ for new capacitors, though if it's fairly new vintage that might not be so dire either. How old is it? Older machines not only have older caps but the older vintage caps didn't hold up as well as newer current vintage capacitors do.
As to the Tentelometer issue; is the deck handling tape OK? If it is (and my presumption that this is a low milage deck is correct) then it's not an issue that needs be immediately addressed. As to alignment tapes - if you're a full Tape Project member you've been provided with just the alignment tape you need!
cdw