I just ordered the Hori Fighting Commander V because I need a decent PC and MAME controller. I used PlaySega! USB Saturn pads for a little while, and while they felt nice, the cheap plastic frequently led to breaks.
Hori typically has a good reputation when it comes to build quality, much like Asciiware did back in the day.
On the upside, it seems like all the Horis are pretty consistent in terms of price ($50 for the new V's, $30-40 for the 4's)