I've used the monitor 30's for heights paired with 70's fronts and 60's as surrounds w/ a CS2 and enjoyed the results. Later I moved my set up around and ended up with 40's as surrounds and 60's as wides and achieved even better results...wides before heights is what I recommend.
Now i have not tried running wides with bookshelf speaker and am not sure if i would recommend it. if you want to run wides get a second set of 75T's or a set of 65T's. I really think that the wides being an exact match or a close match to your mains will provide optimum results. I also think it is best to match your entire front stage, including heights and/or wides with speakers from the same model line. So get the 35B's if you go heights or another set of towers if you decide wides are the way to go.
No need to match your subs with your speaker series, get 2 of the best subs you can afford.
+1 on not having to match your subs to the rest of your setup. I tried the 60's as wides, and it worked ok, but the wife put the hammer down, and I reverted back to a 7.2 arrangement, moving the 60's to surround duty. I would also suggest running either the 75 or 65 series as wides.
Edited by myoda - 5/24/13 at 6:19am