Heather Wilson, NM-1. I think I voted a 7 (I voted some days back) but she fluctuates between 5 and 8 depending on my mood. At a meeting with my old neighborhood association, I had written down an arcane question involving the voter registration laws. When she got it, she admitted that she didn't know the answer right off hand but would look into it. A week or two later, I got a packet in the mail which gave me a lot of information and answered my question. She deserves kudos for good constituency work on that one.
She's the best of the NM Congressional delegation in my opinion. She's not Steve Schiff, who would have racked up 9s and 10s, but she'll do.