i have an old 160gb hard drive and also i have 2 old dvd roms and cd roms which i will by a blueray one later. Definitely try picking up a Crucial M4, Samsung 830, Kingston V+200, or one of the newer Plextor SSD, boot times and overall system responsiveness will amaze you.
Overclocking: Maybe See CPU choice
SLI or Crossfire:Maybe Both boards support these techs. Be sure to pick a PSU at least in the 600w range for mid range pairing of GPU's. It helps to know what class of cards you're aiming at though to completely answer this properly
Your Monitor Resolution: old monitor (is getting a new one soon)
i just want to know if this is all compatible with each other. All you need to really worry about is picking an Intel socket 1155 CPU with the 1155 socket mobo (your platform) and that you're choosing DDR3 RAM (which you are). Every other piece of the puzzle generally falls together with universal compatibility. Of course if you're picking a water block or aftermarket heatsink, make sure the socket matches them also.
Also i will be adding water cooling to the case later Again, see CPU choise above. I've used watercooling before and it has advantages and disadvantages. Are you looking at closed or open system?
PS - i have no idea where the dvd and cd drives open up from the front of the case lol so if you could point it out or tell me if they don't i would be grateful [/quotemsg] There's a door on the front that should swing open
Hope this helps you out a bit, feel free to ask any other questions!