Also, dump the SBM-1. Kind of pointless. I hate to fluff Tascam- no love for them at all- but Steve has tested this thing pretty thoroughly, and equally importantly, it's a second gen deck, meaning it can correct the first gen's mistakes.
I'd love to try the tascam some day, but I have SO MANY recorders... it would have to be, like, $150 and pushed on me to get me there.
The 661 is probably the greatest recorder I ever owned. that thing was rock solid and could be used in any number of ways. I tested it with an SBM-1 and I really think that, if you are going to listen to a 16/44 recording, then why not make one? I only ever taped at 16/48 with the SBM1, but i think it made better tapes than the 24/96 pulls I made with the 661. SO its all a matter of opinion and taste. The SBM1 is the biggest battery hog of everything I've ever used, so if you bring that along, you better have a LOT of batteries or a good powering option. The 661 got me 5 & 1/2 hours on Sanyo rechargeables, and the SBM1 got about 80mins on the same batteries. I ended up using a tekkeon that would power the SBM-1 for 8+ hours, and I could plug in the 661 at the end of the batteries life to finish a long day. Even those Lithium AAs only power the SBM1 for about 5 & 1/2 hours, and n the end, that was the best bet. Bring and extra set or 2, and an extra set or 2 of rechargeables for the bit bucket and you have the weekend...
...but that's a lot of power and a lot of stuff, and I've not even gotten to the PS2.
I spent about 6 months trying to find the right way to keep running the SBM1 in a post-DAT world. I still think that the Complete Line-Stage Oade Mod of the SBM1 in your chain is worth the effort if you like the sound, but you will work long and hard to make it work.
I think the 661 is overkill for just getting a COAX in, but for me it worked like a charm, and it isn't as big as I expected.
So, for overkill, after reading the thread, I'd recommend buying that oade warm-modded tascam hdp2 from dnsacks. That's the best deal out there (at this moment) and will have the so many uses besides the one you want now.
The ONLY downside of that unit is Compact Flash media, and that isn't really a problem. (well, it isn't a small machine, by any means, but it is packed to the gills)
http://www.oade.com/digital_recorders/hard_disc_recorders/tascam_hd-p2_features.html