Very nice. 3rd Gen RX-7s are getting hard to find these days, nice catch. 23K sounds a tad high, but it looks very clean, and low miles too.
Be carefull with the apex seals(edges of rotors, it's a little springloaded thin peice of metal), on 3rd gens they usually break around 50K miles.
And don't baby it around, they need to be driven hard every once in a while(shouldn't be a problem cause I would think that you would automaticly drive it hard lol)or you will lose performance and milage.
Take good care of it, it should last for a long time, and if you ever need major work, just ask me, I'm sure my dad wouldn't mind working on it if you drove it down here or flew him up there, he's had offers like that before. And my dad is a RX-7 specialist, he can fix it or no one can.
Have fun!