It's a fun toy and also a useful tool for a limited audience (mainly search and rescue folks.) Don't buy it expecting to use it with every group you roam with, as most of them will not be APRS-equipped. It's sort of like cross-band repeat capability... everyone really wants it, very few use it and even fewer really need it. Of course, I have both capabilities and fall into that boat... I don't need them, but they're kinda fun once in awhile.
The Kenwood TM-D700A does it natively, without an external TNC (the radio has one built in, as well as its own APRS software.) It is not a cheap radio but it is an excellent one. It does everything, plenty of power, great UI and Kenwood quality. It is a great choice if you just want to "get 'r done" by buying one radio that does it all, including APRS.
Keep in mind that APRS is much less fun if you don't have a GPS that will/can plot other stations as waypoints on a decent screen. I don't have a list of GPS units that will do this; I just know the Garmin 276c/376c will do it for sure. You're looking at a $1200 investment between radio, antenna and GPS.
If you're buying both of these tools (radio and GPS) and want quality, might as well go for the APRS-capable stuff as they are also excellent quality tools in their respective fields. But don't lose sleep over buying a setup that doesn't offer APRS. It's not that big a deal.