Make sure wherever you buy it you get free shipping -- otherwise, it'll run up the price..... these things are fairly hefty.
I bought one several weeks ago through Dell (during the last stackable 10% off/free shipping/$25 off coupon extravaganza) and am very satisfied with it -- the output looks really great.
I originally was going to get the 1450, but finally decided to pay the extra $$$ for the 1650 to get the duplexer (came to the conclusion I had better things to do with my time than to continue to impersonate a duplex module).
I don't like the Brother duplexer as much as the one on the Lexmarks we have at work (with totally internal duplexing, whereas the Brother has to run out the paper into the upper tray, then pulls it back down into the printer to duplex), but you get what you pay form ---- those are pretty expensive network lasers. The Brother unit does get the job done, though.
One thing - the standard 8mb memory provided is pretty lame, especially for printing anything halfway complex at higher resolutions.
The easiest way to cure that is to use the 15% off forum link to Crucial to pick up a 100 pin DIMM upgrade module. I added the 128mb module (why skimp, considering that they are so cheap now), but the 64 (or even 32) mb modules would probably have sufficed for most uses.