Well, Car Audio magazine says that the best 12 they have ever tested is the Critical Mass UL12. Oh yeah, its $2k

Seriously, how can anyone give a recomendation, without knowing:

What kind of music you like
how much space you have
how much power can you afford

and finally

how much you have to spend

All the woofers mentioned have goods and bads, but you cant pick 'best' until you know the criteria.

Toby