First of all... re: MBox... I don't think you can sync one of these with SMPTE. I've had to jump through hoops to get a 001 to sync to tape.
If you can afford it, get a 001, a MOTU MidiTimepiece and any converter that has an external wordclock reference and outputs S/PDIF. With a pair of Lucid Converters, it'll put you at around the $2000 mark, but you'll have a very versatile rig, as you will be able to fly in and out off of tape, (like doing the eventide thing 'cept much, much better) and seriously, I don't think you'd be losing too much to give up two tracks of tape in order to have 32 syncable tracks... I'm running a 24 track, so maybe I'm not feeling the crunch of track limitations, so I don't mind giving up 23 and 24 for Timecode (and neighboring guide track, as smpte WILL be picked up by track 23 on the head of a 2" 24 track).