Look at the Dewalt 621 plunge router. Hogging out deep or wide dadoes in one pass is probably not a good idea - both in terms or heating the bit and finish of the edges. Same goes for doing molding with a router. Most plunge routers have a 3 step "turret" which lets you make cuts in 3 passes with some DOC control.
The DW621 has a nice smooth plunge action, a dust port in one of the plunge columns that actually works - and pretty well at that. One wrench bit changing is also a godsend - hate the PC two wrenches approach. The base of the DW621 has two FLAT sides- much easier and more accurate than a less than well centered round base - ala PC. Has variable speed as well - if you're planning on using larger diameter bits - you need lower RPMs. DW621 also has semi-micro adjustment for depth of cut.
If you're going to use it hand held - check Pat Warner's site for a nice thick - BIG roung base for the DW621 - it's a little tippy on some cuts - like around a corner.
I've got and regularly use both of my 621s - one hand held, one in my router table. Getting use to the trigger and trigger lock on one handle and a depth lock on the other takes a few minutes to get used to but not having to take your hands off the handles is really nice.
charlie b