the only issue is size, some of those power supplys can get rather large and wont fit in some cases
+ Noise ... Higher-end power supplies tend to have higher speed fans which can make more noise (note this does not apply to all high-power PSUs, some 1000W units can be very quiet).
This is what I would do for $1000:
Case - Antec Three Hundred
Power Supply - Corsair CMPSU-450VX
Motherboard - Asus P5QL-E
CPU - Intel Core 2 Duo E8500
CPU Cooler - Arctic Cooling Freezer 7 Pro
Memory - 4 GB (2 x 2GB) OCZ Platinum XTC PC2-8500
Hard Drive - Seagate Barracuda 7200.11 500 GB
Optical Drive - Lite-On LH-20A1S 20X DVD-RW
Graphics Card - Visiontek Radeon HD 4850 512 MB
Operating System - Windows Vista Home Premium 64-Bit OEM
Anti-Virus - ESET NOD32 Anti-Virus OEM