Well,....I would suggest you look at a used Control 24 with upgraded power supply for no more than 3k.
I went with a used Pro Control with 2 fader packs and edit pack. These things are great for controlling plugin and protools. The lack some of the direct access buttons that the newer C24 provides but still is a great controller. I paid about $4500 for the controller+argosy desk. That should hit your 5k budget
The Smart AV Tango is also an awsome controller!!! You can add faders banks of 12 to these but it's costly!
The Euphonix are great as well and are way more modern than the Control 24 and ProControl. Plus AVID owns the company now...... You can also add faders to them as needed.
I have a Tascam 1884 as well that does a pretty kickass job controlling PT but lacks scribble strips. All in all it is a well built peice of equipment. You can add faders to these too!
Ummmmmm the Mackie Controller Universal Pros are good too and you can add faders to them as well. About 3k for 24faders.