Yeah, I'm a NY'er.
I would strongly recommend you talk to Rudy and Ken. They both have different things to offer. I've used Rudy's for a lot of my high end accessories (like Lehle switchers) and some pedals, but never bought and amp or guitar there. Their shop has a great reputation and a lot of snob appeal. The only guy I do business with at Rudy's is Ariel; he's nice enough but the majority of the staff can be a bit hard to take from a consumer standpoint.
I've been jamming at Ultrasound for over a decade and if it wasn't for them I would never have had real world experience with high end/hand made amplifiers. Ultra has all of the amps they carry arranged in rehearsal rooms so that you can really put the amp through the rigors of a gig like situation. They are not exactly friendly unless your cc is out on the table at all times, if you know what I mean.
For my dollar, I would go to Ultra 10:1 over Rudy's. It's debatable about which shop has more traffic, but if you look at Ultrasound's adverts you can see they carry a lot of high end amplifiers.