Hi, sorry to take so long to respond to this one! wow, it's hard to say, because there are a lot of good matches. here are just a few off the top of my head.
first of all, almost any of the sampras/agassi matches would be of historical interest I think, and some of them were close in score. here's the link for all the matches:
Sampras vs. Agassi
even though he lost, Federer/Agassi Round robin at the masters cup this year was awesome!
El Aynouai/Agassi in Miami 2003 was amazing!
Agassi/Hewitt in San Jose 2002 was a classic, even though Andre lost
I liked Agassi/Federer Miami 2002 final
I haven't seen it, but I imagine Andre's 1990 year end championship title win against Edberg would be of interest!
Andre's match against Grosjean in Madrid last year sounded good (didn't see it)
well, I will keep thinking about it...