Android phones, apps and tablets

After much procrastination I want to buy an unlocked S4 very quickly. Just had to return a refurbished one to Purple Gossip (ebay shop) as it was delivered faulty.

Any suggestions for where I can pay about £300 (preferably a little less) for a reliable S4? Pref not in white as I'll just grubby it up.

Scan doing brand new, 16GB,black ones at £300 with free P&P