The Oxxford I've only seen at 14th St Union Square, which typically carries the largest selection of high end labels. You really have to go when they get an Oxxford shipment. They must get 40 or so at a time, and they often have interesting cuts like Oxxford Crest in super fabrics. They got some Canali suits and ties recently (800-900 for a suit, 40-50 for ties). Oxxford suits for 1000. Corneliani typically at 600. Vestimenta, and Armani Collezioni I forget, but around 700-800.
The Hickey Freeman at 14th st is priced strangely. The fused Hickey Freeman LTD is priced at 600, as is the fully canvassed Hickey Freeman Collection (models Madison, Canterbury etc.).
At 14th st Beware the entire rack of "Zegna" labeled suits, which are only "Tussuto Ermenegildo Zegna". These are thickly fused of unknown quality, and priced quite high! Who knows the manufacturer? Also, some "Manzoni" suits were priced high and sitting on the Armani rack.
At 18th st today I saw some great suits in my common size (42R). Some of the suits seemed priced much lower than at 14th st (like the zegna tropical wool suit I bought today), as if that store didn't get as much traffic. There were two Canalis (charcoal in rust windowpane), a Hart Shaffner Marx, and an Armani that were quite nice.
Like any discount store, FB is kinda hit or miss. It all depends on what your size is. If you are a Long, you will be pretty happy. Also, they have suit sales from time to time, for an extra 100 off.