Well, I'd mention the fuel pump and filter, but that was more of a '99 problem than a 2000.
Updating the clutch means changing one of the plates, which can be done on the next oil change. Super easy to do. ~30 minute job if you've never done it.
Cam chain tensioner was a '99 recall, IIRC. Just look at the engine side where the tensioner is. If there's an oil line coming out, you're ok.
If you want the passing light switch, you can go one step further and get the headlight switch. Just hook up with someone in the UK on the boards who has the handlbar switches. Got mine like 4 years ago, but I'm sure you can find them. Direct swap. ~$40-80 each side was the going rate a few years ago, probably about the same now.
Contrary to what you might hear, there is no speed limiter through 2000. So you can get that extra ~7 MPH without having to do anything other than find a long enough road and hold the throttle wide open. Although the 32-bit ECU (added in '03... or was it '05, I can't remember...) will be smoother.
On the subframe, keep the hump on, don't load it full of cargo and, as much as you might be tempted, just say no to fat chicks.
Oh yeah, and you can tell people you're bike goes 220... because the speedo says so.