have you considered (at all) not using ProTools? just curious
here again, it depends on how many tracks will you be recording at one time? an acoustic, or a singer... or a full drum kit?
If the latter an M-Box probably won't help much- as you've not mentioned ProTools HD we can rule that out
the 002R, though older, it pretty affordable, and IMHO the 003R doesn't really offer that much in the way of improvements- either unit gives you 4 inputs (with non bypassable pres....

) and 4 direct ins, plus another 8 channel ADAT/light pipe, and 2 more SPDIF, though I've never needed 16 tracks (I have a Presonus DigiMax via lightpipe in my 002R)
Now, if the M-Audio ProFire 2626 will work with 8.0, I'd go that route- it would use M instead of LE, but according to most reviews has better pres, and a better clock and with 26 I/O
I would hold off till after Winter NAMM later this month to see if Digi rolls out anything "new"