I'd read about SriPraPhai in Woodside (Queens), and many people would say it's the best,
and I found it very good when I went with my brother about a year ago, but I honestly don't think it's worth the trek to Queens unless you feel like an adventure. smileys/irritated.gif
Wondee Siam II is on 9th Ave. at 54th, and while it's quite small, if you go at an off-peak hour, the noise level should be ok. The food is good (although the green curry is a little on the watery side)--extremely fresh ingredients, and the service is always good. It's not as good as SriPraPhai, but it's on a par with it (and without the 30-minute trip on the 7 train). But I do think Republic does a better Pad Thai than Wondee Siam. Ah, well. Sorry I can't give more apt recommendations... I just think there's no high-end Thai in Manhattan--it's all in Queens or Brooklyn.