would this upgrade make sense?

[networkresearch]

i'm going to ramble a bit so please bear with me.

i'm one of those home recording amateurs that ask stupid questions. i got into it because it has always interested in recording and i wanted to make demos for one of the bands i'm in. nothing fancy, but you know how the gearslut bug gets to you.

three years, two records later i'm in a real studio with another band recording an ep. it's being done in protools and sound really good. the thing that is making me rethink my home studio is we recorded 16 tracks simultaneously and then overdubbed as much as we could simultaneously. seven songs, three days.

at home i can do eight tracks at a time and now think this is limiting.

here's my list of gear, what i'm thinking as to how to remedy this and please tell me if this will work or should i not bother.

mci jh110 1" 8 track for basic tracks then dump into
motu 828 mkII
logic 6.41
powerbook g4
api pre's
d&r console (chopped up 8 channel)
purple 1177
pmc tb2-a
1 akg 414 eb
2 at 4060
josephson c42 mp
senn 421
sm 57
unidyne 545

i get pretty good results for a total amateur. here's my thoughts:
i buy another used motu to run 16 tracks simultaneously
can i record 8 tracks to tape, send that off the cue head to one motu and record 8 more tracks with the other one? is there "latency" for lack a better way of saying it if i go off the cue head? will all 16 tracks be synced up?
i realize the motu's aren't the greatest, but for short money i can get one and not have to alter too much as opposed to say an apogee ensemble where i would need a better computer and logic upgrade. this way i could also get a bunch of dynamic mic i'm lusting after.

help me out, curse me out, any opinions welcomed

thanks,

jonathan

[andychamp]

If you run OS 10.4 (Tiger) on your Mac, you can hook up any combination of audio interfaces and have the system recognise them as 1 big interface with all its ins & outs in sync. That system won't care if the input signal comes from a tape machine or from a live instrument.
Or you could go out the 2nd Motu into the 1st via ADAT lightpipe. That second unit doesn't have to be another 828, BTW. Might as well be any 8-channel converter with ADAT optical connectors (Behringer or SMProAudio if you wanna go real cheap, or RME, Appogee or MetricHalo if you got the $$)