Aria, Overclockers, Scan, Ebuyer are all pretty good like SPS said. Vengeance RAM is good, so is G-Skill Sniper. You could also consider Mushkin blackline or Kingston Hyper X.
Just get the RAM with the lowest timings or the one you like the look of best, it's all the same underneath, just stick to known brands and you will be ok.
Personally I wouldn't bother with overpricers... I mean overclockers
they are a rip off and have crap CS, Aria, YoYotech, Scan and Ebuyer are all good i've had one bad experience with Scan but on a whole they are a good retailer.
I use OcUK for everything these days, I bought the 16gb of ram thats in my pc specs from there for £75 which I reckon is pretty cheap although that was on sale but still the pricing is pretty decent there
one thing to remember is SB dont give a bugger about timing lol I keep seeing all these comments on different threads on it. Even Tom said it in a vid a few times. Cant recall where I read it but I'll look for it after another BF3 round or 10
It's the other way around guys SB doesn't benefit from a larger bandwidth 1600mhz is the more than enough for SB. Lower latency (timings) won't give much of a performance boost but if you have the money you might as well buy some good RAM with low timings, if you want to save some money though just get some CL9.
The point I was trying to make in my other post though was that it doesn't really matter which RAM he goes for as they are all the same. There is no difference between 9-9-9-24 1600mhz Mushkin Blackline or 9-9-9-24 Corsair Vengance same applies to other RAM with the same frequencies and timings. The only other differences between some RAM is voltage which doesn't really matter unless you are OCing which there is no point for SB and the other difference is looks.