256GB SSD is overkill imo. Get a 64GB, Raid 2 1Tb Blacks for speed, and get a 2TB one for storage. I am pretty sure 1155 is dual-channel, so getting a trichannel kit is not going to help you much. 2x4Gb and upgrading in the future for another 2 sticks is what I have in mind right now. You will also want an aftermarket cooler, there are plenty of good ones out there. Probably something along the lines of Noctua C14 or Thermaltake Frio. Instead of getting a G15, you might want to take a look at mechanical keyboards, they seem to be better. As for mouse, I would stay away from Razer as much as possible, and take a look at others instead like Steelseries and Saitek.
As for Audio card, I am not too sure about Creative's offering, I have heard good things from other manufacturers too, eg Asus's Xonar range. Take a look at that (if you haven't)?