LED is a thinner monitor, tends to have a more vibrant picture, and a good response time. Of course in getting an LED you will likely be paying more as it is newer technology, which really aside from weight, can be handled just as well by its LCD counterpart.
LCD is a little bit less eco friendly, runs a bit hotter, but will also run you about $100 if not more cheaper than a good sized LED monitor.
As for your build:
-CD/DVD Drive: I would recommend a Lite-On CD/DVD burner, they tend to be more reliable than Sony Optarics (and this is coming from someone who uses both a Lite-On DVD/CD Burner and a Sony Optaric Blu-Ray Player/Burner so no bias, just the truth)
-Case: That is a fantastic case, unless you can afford a Cooler Master Haf X, I would most certainly stick with that Antec 900
-HD: I do not recommend Seagate, their old drives were fantastic, and directly on par with Western Digital, unfortunately in the past few years their parts have began getting outsourced, thus their drives have had more issues now. I would recommend a Western Digital Caviar Black 1TB or 2TB FASS Drive, they are extremely fast for a standard sata connected hard drive, and very reliable.
-PSU: I don't know much about the quality of OCZ's power supply units, this to me is a problem in and of itself. You do not want to cheap out on a PSU as it is what stands between your system working right or not. I would recommend the Corsair Enthusiast Series Power supply line, they use high end parts in their new builds (do not get the older models as they were unfortunately using parts from other companies and having issues) You pay a bit extra for it, but would you rather your system fry out and have to rebuild the entire thing again for about 10x the extra cost? Newegg.com - CORSAIR Enthusiast Series TX650 V2 650W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply
-Monitor: Very solid monitor, my buddy uses three of those in a tri setup and I actually considered buying a couple for my 6 screen setup, very reliable, very sturdy, great picture, and overall good price. The monitor will also have no response lag as that is right about the specs of my 2 2709m 27" Hp monitors have and I use them for games such as Street Fighter, Tekken 6, and Skate 3 all of which rely on no lag.
Motherboard, Processor, and VGA Ill allow others to give advice on, I don't like buying overpriced items when I can save money for the same performance
Hope it helps