Best PFs to buy, and where to buy them?

[larsb]

(This is only slightly related to the recent thread on PF spouts. I'm not giving up on my Rancilio PF.)

I'm considering getting
(1) a PF that can accomodate an LM(-style) triple filter
(2) a bottomless PF (obviously a candidate for (1))
for my Silvia.

Does anyone have any recommendations for the respective kind of PF, and where would the best place be to buy them from?