Personally, so long as we're talking backup, I think Spriggs would be just fine. My only concern, however, is that we don't spend too much on that position. I'm all about offensive line depth, but if last year taught us anything, it should have taught us that QB depth is important too. And, right now, with the AWESOME off-season we've had, I'll be content just so long as we lock up Griese.
On that point, I just want to say that I was one of the people who questioned WannSpiel about the lack of early off-season moves. But, if we pick Griese, I think our FO has done a SPECTACULAR job loading us up for a Super Bowl run. My hat will be off to them.