One option that hasn't been mentioned is the Router Raizer
http://www.routertechnologies.com/routerraizer.htm
Runs a little under $100 most places and is, essentially, a package of hardware that will convert most routers (consult application tables) to above table adjustments.
I run a Freud 3000 which has above table adjustments, bit changes, etc. and the mechanism for most routers with built in adjustment above table adjustment is similar. The major shortfall, if you can call it that, is that most lifts provide a height lock. On my 3000 I need to reach under the table and engage the plunge lock to achieve height locking. On fixed base routers, you still need to reach under to lock the motor. On my Freud, engaging the plunge lock usually results in a shift in height of about .005 to .007". That's normally to small to be concerned about but I do have a Wixey digital height gauge for when I need to lock it in exactly.
While a lot of routers have built in lifts; Triton, Milwaukee, some Porter Cable, Freud and even some Craftsman, the Triton, IMO, has the edge in dust collection as the entire collet area is surrounded with a vacuum chamber.
Good Luck, whichever way you go.:smile: