Peanut, I own the C530 and was in the exact same boat as you. I stood in Makro for close on 2 hours trying to decide between those 2 models. The 2" extra on the LG was the only thing making me lean towards it more than the Samsung, but I am personally not a huge LG fan. I finally decided that the 2 extra inches wasn't worth it and went for the Samsung.
My honest feelings? SD Dstv is average, I was pretty disappointed in it, still am, even as I lie in bed watching the dog whisperer

Its not THAT bad, but when you see a more expensive LCD or a plasma you notice the difference.
Gaming is pretty awesome on it, but then again gaming on any flat screen is nice. I bought a Plasma for my lounge and am way happier with the quality of my DSTV, which is one of my big uses for it. Gaming on it it also fine, no issues there.
Personally if you are going to use the TV mainly for DSTV and sport try save some cash and get a better LCD model. The C530 is after all the entry level. Or if you are not apposed to plasma, look at the 42C430, only about R5899 and will give you better DSTV quality.
Good luck