Your existing links are all top notch - adding some more 'pedestrian' quality links (but still valuable - not spam) will hopefully get G to give your site some link love in the SERPS.
I wonder if in the case of the original poster whether it might be a good idea to get a few nofollow links as well, just to keep things balanced?
While they won't flow page rank, they will at least fill out the link profile. I think that google would be a little suspicious if ALL the inbound links were dofollow links.
I guess the important thing is to figure out on the web, as a whole, what is the ratio of nofollow links to dofollow links (Matt Cutts said there were way more dofollow than nofollow links, but that might have changed since he said that). Probably it would be good to have a ration of nofollow to dofollow links that mirrors the web as a whole.
Also, I wonder if nofollow links from relevant sites might not possibly add to the "authority" of a domain. I remember a video where Matt Cutts said that nofollow links "don't pass much page rank." Maybe it was just a goof on MC's part, or maybe there is something to nofollow links.