I will just make a comment about primes I recommend. I own the FA 31, DA *55, FA 77, and D FA 100 mm WR. I feel like this is pretty good prime spacing and covers most of my needs. At some point, getting a longer prime (probably DA *200) and a wider one (DA 15 limited?) will probably finish things off from a prime standpoint.
Zooms are a different story. I would just say that if fast focusing is important, than going with Sigma's HSM lenses is probably worthwhile, since Pentax DA * lenses, while excellent optically, suffer somewhat with regard to slowish focusing (due to SDM).
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