Custom built computer

[Wiro]

Hey.
I don't know how familiar your with computers overall, but I consider buying a computer, or actually, computer parts.
I don't plan on building it by myself, even though I probably could, but I feel safer to have a computer maintenance store build it for me.
I'd like to know your thoughts about this and/or experience about custom computers.

Here are the parts:

ASUS M4A89TD PRO/USB3 ATX AMD Motherboard

AMD Phenom II X6 1090T Black Edition 3.2GHz Socket AM3 125W Six-Core Desktop Processor

PALIT GEFORCE GTX 560 TI SONIC - 1 GT GDDR5 - PCI-EXPRESS 2.0 Graphics card

G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory

Crucial RealSSD C300 CTFDDAC064MAG-1G1 2.5" MLC Internal Solid State Drive (SSD)

Western Digital Caviar Green 2TB 3.5" SATA 3.0Gb/s Internal Hard Drive -Bare Drive

I'm still thinking about power supply, case, fan, and probably the cheapest dvd-burner

So basicly the computer has two drives, a 64Gb solid state for the os, and a 2Tb hdd for the rest of the stuff.
8 Gb RAM
Geforce GTX 560 Ti graphics with 1Gb memory
AMD Phenom II X6 3,2GHz cpu
and a motherboard with usb3 and stuff, which should be compatible with the above

The whole package (with the cheapest case, power supply and dvd burner) it costs 820e (+shipping)

Also I'd want to know about a good monitor for this.