The gear you listed would absolutely work, but I'd make a few suggestions. The SBM1 is strictly an A/D converter, not a pre-amp, so it doesn't provide phantom power. Granted, you can run the c1000s on a regular 9v battery, but you'll be glad you chose phantom - trust me on this one.
I'd replace the SBM1 with a digi-mod UA5, which is a combination pre/AD converter, and can be bought new for about the same price as a used SBM1. This is an all around steal for the money. Also, if/when you decide to upgrade your mics, the UA5 will still be a great choice.
I think you'd be perfectly happy with the c1000s>UA5>D8 rig...lots of good tapes have been made using this combo. Those 3 pieces of gear + a stand, shockmounts, t-bar, a bag, and cables could be had used for under $1000.