Hi Mike,
You are a few weeks behind from myself having just purchased a 2001 Boxeye.
As stated the headlight mod is a good start although I've fitted LED Spotlights to the edges of the radiator, these make a huge difference and the spots outperform the headlights.
I've fitted heated grips, although now it's turned to Summer I don't need them.
I've opted (somewhat controversially) for smoked indicator lenses as I found the orange ones made them look longer stemmed than they actually are. A matching smoked LED tail light will be going on this weekend.
From a pratical sense the 12mm sprocket nut is a must. I've checked for play in advance and so far haven't got any but I've already got a new 12mm nut and will fit that sometime in the next week. Prevention being better than anything.
I've not noticed an issue with the suspension front or back but then I'm still getting used to her so maybe in time they might be mods I consider.
Welcome to the group, since my arrival I've found people very welcoming and helpful. (Just don't mention smoked indicators) Lol.