Motherboard: Look at the abit IP35 series like the IP35-P, a Gigabyte P35 board like the GA-EP35-DS3R, or something in the Asus P5K line like the P5K SE.

Power supply: Corsair makes some excellent units, and basically anything in their inventory would work. I'd shy away from the VX450, but only because I'd be worried the 30A +12V rail might be a bit lean for your system. Their HX1000 might be out too as it's plain overkill. I have been hearing on [H]ard|Forums about some deals on their TX750 for $100 if you keep your eye's peeled.
I'd also look at an Enermax ModU +82 or Infiniti unit.
Others:
-PC Power & Cooling Silencer
-Seasonic S12/M12 series 500-600W
-Silverstone 500-600W
-Thermaltake Toughpower 600-700W

Stay away from:
-Q-Tech/Q-tec
-Powmax
-Logisys
-Ultra (mixed bag, so some are good, but they seem to be sliding on quality)
-Apevia (formerly Aspire)

RAM:
OCZ or Corsair, especially if it's with a rebate. Both companies are very good about getting these to you, unlike some companies (I'm looking at you, Foxconn). If you get Crucial and go with their Ballistix stuff, keep in mind that you will need to have airflow over this stuff. Both the original DDR and DDR2 modules require good air to continue to operate happily. Their RMA process is excellent, but I'd personally avoid the Ballistix as I've gotten tired of doing an RMA every few months.

As far as good LCD's under 19", yes there are, but 19" seems to be a bit of a sweet spot in the budget real-estate area. Going with a 17" doesn't seem to be that great of a deal these days. LG, Samsung...good brands, although the KDS and Hanns-G monitors are pretty good despite not being a brand people think of to start with.