Question about a Build + Needing of help

Hi everyone,
So, im looking forward to buy a new desktop, but my budget is kinda low and i was wondering if the setup i encountered could run at least the game im playing more right now (League of Legends) at lets say, max settings and still have 50ish FPS. Also, if anyone knows a good 450> desktop i would be very gratefulto hear your opinions  

Here are the specs (taken by http://www.ramcomputersystems.co.uk/product/rcs_ultima_...):

Processor:
AMD Athlon X2 250 Dual Core @ 3.0Ghz

Memory: 4 Gigabyte DDR3 1333Mhz

Graphics Card:
AMD Radeon HD5450 1Gb PCI Express HDMI

Hard Disk Drive:
500Gb SATAIII 6Gb/s

Motherboard: Biostar MCP68S USB2 PCI-E

Audio: Integrated HD Audio
USB Ports:
4x Rear USB 2.0 Ports | 2x Front USB 2.0 Ports

Networking: Internal Gigabit Network Port

Optical Drive:
22x SATA DVD-Rw/CD-Rw Combo Drive
Case: Atx Case
Power Supply
550 Watt Power Supply

I never were a fan of AMD, always prefered Intel, but seems like the charts of performance are kinda the same, and yu can build a setup from AMD for less money. If anyone knows about a nice Intel Desktop below 450 i would love to hear it   (PS: Is the site "www.ramcomputersystems.co.uk" trustworthy? Anyone has feedback about it?