Afterreviewing the posts and playing alot of the games (again)i would have to say Jeff Minter is the king of shooters.
I think the top three should be
1.Tempest 2000 (frenetic is not the word)
2. Ancipital (everyone overlooks this fantastic shooter)
3. Revenge of the mutant camels.
the other shooters I`d mention are
thunderforce 3 and 4
Uridium, R-type and Darius Gaiden