IMO go for the Palit. It has a far better cooling system. There are two companies who are not very well known in North America, Palit and Zotac. Save some coin and get the palit. Both companies just rock and are just making their way into the NA market now.
palit puts time and thought into its cooling systems and their products are of very high quality... i am actually pretty new to the overclocking and system building scene being only 13 years old, but i did learn a lot in like a month of tomshardware my first custom built system that im using now has a palit in it and WOW.
Anyway, i only know Sapphire (so so cooling solutions) first hand and Powercolor (my Radeon 8500, no issues, but i was a n00b back then, lol). Also there's XFX, wich is cheap, but it's coolers suck big time.
I'll settle for Palit then. Well, to be honest, I was actually leaning towards them to begin with but was waiting if you can share your experiences with these specific cards. I like their approach better when it comes to cooling the 4850 (compared to Sapphire's). I forgot to post the pictues on the original post though
Where I am at, the difference between this 4850 and a ref 4870 is $80-100 US. (I cannot afford that much ATM )