I would recommend this rack:
http://www.topeak.com/products/Racks...larRack_w_o_sp
and an MTX trunk bag (I have this bag:
http://www.topeak.com/products/Bags/MTXTrunkBagEX with an Explorer rack).
This would be a
wonderful set up for commuting.
Throw some panniers on for touring (and maybe a front rack w/ panniers) and you're good to go.