How will this system work for Ubuntu?

[sJ&$op*2W]

I've been running Ubuntu on my iMac and I'm now looking to build a Ubuntu system. How will this hardware setup work? Am I buying anything I don't need. I have two 1tb drives I am also going to include, one for media and one for backup. The 500GB drive will be partitioned for system and home. I plan to add a discrete graphics card later.

OKGEAR 18" SATA II Cable Model GC18ATASM12 - OEM x3

OKGEAR 18" IDE round cable,single device,Clear Silver Model RC18IDES1 - OEM

StarTech 4.73" SATA Power Y-Splitter (3 Outputs) Model PYO3SATA - Retail

LG 22X DVD±R DVD Burner Black IDE Model GH22NP20 - OEM

Rosewill R5717-P SL 120mm Fan Pre-Installed on the Top and 80mm Slim FanCooling HDD,ATX Mid Tower Computer Case - Retail

Seagate Barracuda 7200.12 ST3500418AS 500GB 7200 RPM SATA 3.0Gb/s
Hard Drive - OEM

Hanns·G Hi-221DPB Black 22" 5ms Widescreen LCD Monitor - Retail

EDIMAX EW-7128G PCI Wireless Card - Retail

hec HP485D 485W ATX12V Power Supply - Power Cord Included - Retail

Kingston 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual
Channel Kit Desktop Memory Model KVR800D2N6K2/4G - Retail

ZOTAC NF610I-E-E LGA 775 NVIDIA GeForce 7050 Micro ATX Intel
Motherboard - Retail

Intel Core 2 Duo E7400 Wolfdale 2.8GHz LGA 775 65W Dual-Core Processor
Model BX80571E7400 - Retail

Link Depot POW-SATA 4-Pin PC power to SATA Converter - Retail

[sJ&$op*2W]

I should note that my alternative is to get a Dell system and make some upgrades, but I really like the 4 HD bays in this case.

I really appreciate any help anyone can give me before dropping such a huge amount of money.