What capabilities are you looking for? Built-in drum machines? More than one input? For the less expensive and easiest to use, I'd go with the MR-8. This is from the Tascam website on
the DP-01:
The DP-01FX adds XLR microphone inputs with phantom power for connecting professional condenser microphones. It has a multieffects processor for adding effects to an instrument during recording and a reverb processor for adding effects during a mix.
8-track recording at CD quality 44.1kHz/16-bit
2-track simultaneous recording
Dedicated stereo mixdown track
Dedicated controls on each channel for volume, pan, effect send, EQ high and EQ low
Eight 45mm Faders plus a dedicated Master fader
Two-band semi-parametric EQ per track
Two 1/4" TRS mic/line inputs
Two phantom powered XLR microphone inputs (DP-01FX only)
Guitar level input
Built-in reverb processor (DP-01FX only)
Built-in multieffects processor (DP-01FX only)
Effects send and stereo return
RCA line outputs
S/PDIF Digital Optical output
Headphone output with level control
MIDI Timecode and MIDI Clock Output
USB 2.0 port for computer backup
Track editing: copy, paste, move, erase, silence
Built-in 40GB hard drive This could be a good thing, the MR-8 records on a compact flash card, you can only go as high as 2GB
I think the Boss is good, but costs too much. But it has the built-in drum machine.
My 2 cents...
Rokket