If you are using Windows XP, drop down to 2 x 2GB sticks instead, but stay with 2 x 4gb sticks for Windows 7.
That being said, I think you should seriously consider getting an i5 2500k instead of the i5 2400. The two should be pretty close in price and the 2500k is the best thing you can possibly get for gaming.
You have an 1155 motherboard and the i5 is an 1155 processor, so that checks out.
The motherboard supports 1333 RAM which your chosen RAM is. As long as you are going to be using Windows 7 then the RAM is fine.
The PSU is a 550w and all those parts in total should still come well under that. The manufacturers suggest a minimum of 450w for full systems using the HD 6850 graphics card and yours qualifies for this minimum and is from a good maker so it can be expected to perform at its stated wattage.
Those are the 3 main compatibility conflicts and you should be fine in all of them.