HELP: Comp good ?

[belmin]

Is that pc reasonable for 300$ . ?
Its 3 years old, should i be worried if it would break easy?

Motherboard: Asus PSN-E SLI
Processor: Intel Core 2 Quad Q6600
Memory: 4 GB (2x2) DDR2 OCZ 2VU8002G
Graphics: EVGA Nvidia GeForce 8800 GTS
Sound Card: Creative Sound Blaster X-Fi
Hard drives: 1 (500 GB) and 1 (320 GB) Western Digital Caviar drive
Wireless: Linksys Wireless-G PCI Adapter
Optical Drive: Pioneer 112D DVD R/RW
Case: Antec P190

[Geek-9pm]

Here is a serious answer.
The motherboard itself is worth $100 m+ on the resale market.
Intel Core 2 Quad Q6600  can be worth $150 and up.
Ask the vendor what he will warranty for six months. 
The CPU would be your biggest replacement cost if it failed.
Memory and  hard drive prices are lower now.