Originally posted by drinkyT
Let me ask one thing...can someone recommend a good ND and cirular polarizer and an ND?
Is ND so important you listed it twice? I'm presuming you meant UV, but may have intended something else.
Hoya is the most obvious recommendation; they're common, don't affect sharpness, and are a fairly neutral grey that doesn't add a noticeable colour-cast. On eBay, Cir-Pols should cost you a tenner or less including postage (unless you're after 77mm or larger), NDs ought to be cheaper.
You might consider slim filters, which are shallower and intended to avoid vignetting, if you're given to shooting wide angle or planning on stacking them with colour filters. However, as you seem to be intending to use a step-up ring, this might not be necessary.
My understanding is that the Hoya logo has gone through at least 3 versions. The oldest has a low horizontal in the H, and the Y looks like a tuning fork. I think they then went for boring HOYA. The most recent has the horizontal of the H looking like a shallow lentil and extending into the O.
'Pro1 Digital' and 'HD' were high-end lines which attracted the efforts of Chinese fakers. They will still be circular polarizing filters, but won't have the anti-reflective coatings; just something to be aware of. Plain Hoya Cir-PL filters will cost you 2 stops of light; the HDs only one stop.