I've recently been doing research on an arcade stick as well.
From what I've read, the Street Fighter 4 Tournament Edition arcade sticks do use Sanwa parts and are supposed to be fantastic. However, they are difficult to find now and start at $100 but can easily go up to $300. Here is a short list of the Tournament Edition sticks that I know of:
-Street Fighter 4 Fightstick Tournament Edition (the original)
-Street Fighter 4 Fightstick Tournament Edition Round 2 (for the most part, only cosmetic differences to the original)
-Super Street Fighter 4 Fightstick Tournament Edition S (Smaller than the original)
-BlazBlue: Continuum Shift Fightstick Tournament Limited Edition (Identical to SSF4 Fight Stick TE-S)
A more cost effective option would be to purchase the regular SF4 stick, which can be had for under $100. The quality isn't as good but it's fairly simple modify it with Sanwa parts to create a "quality" stick. Supposedly, some of the Hori sticks are difficult to mod.
In any case, if you do decide to purchase a SF4 stick, like Smackbaby mentioned, please get the Xbox360 stick. The 360 sticks are essentially plug and play while the PS3 sticks run into driver issues with USB. With the PS3 sticks, your motherboard needs to be using a UHC 1.1 USB controller (Intel proprietary) or you'll need to purchase a PCI USB Controller with the Via VT6212 chipset.