My suggestion is that if you can wait it out, just wait until next April/May before you pull the trigger and lock in your current rate. By then you'll have an excellent sense of where interest rates are going and can decide if you want to wait an extra year. Interest rate resets occur every year on July 31, based upon the 91-day T-bill auctioned on May 30th or so. I think you can lock in your current rate so long as you consolidate before the auction date (NOT the rate reset date).
That's what I did. Every year in April, I started studying interest rates to see where they were going. So long as interest rates continued to go down, I didn't touch my loans. In April 2005, interest rates were rising over the previous May (185 basis points higher) so I went ahead and consolidated in April 2005, locking in at 4.17%. It was a good decision because in July 2005, the interest rates did jump 200 basis points over the previous July 2004, and in July 2006, interest rates jumped another 200 basis points over the July 2005 rate. As you know, student loan interest rates have been floating around that 7-8% level until this year.
I had a classmate back in the April of 2002 who told me that her loan payments were killing her and she was going to consolidate her loans. I begged her to wait just two more months until after the interest rates were set to consolidate -- the t-bill rates had already dropped 200 points from the previous May, so there was no reason to think that interest rates would suddenly jump up more than 200 points in the next couple of months. I don't think she understood what the heck i was talking about because she went ahead and did it. Sure enough, two months later the t-bill auction closed 10 points lower than the April 2002 rates. With the on-time payments and auto-pay discounts, I pay 3.0% interest rate. She pays 5.5%.
Another reason to wait is if you are currently enjoying the on-time payments discount. Back then the on-time payments discount was 200 basis points. So my discounted interest rate was actually 2% that I got to enjoy up until the consolidation date.