So I'm looking to finally upgrade to liquid cooling and I narrowed down the choices to these two. Im pretty sold on the 100i but I do not know if the 105 will be significantly better. Im also looking to overclock my rig(3570k, gtx 670, cx500watt psu) but I do not know if these coolers will be an overkill, if its actually possible. Also, will the install be difficult with a already complete and running rig? Any suggestions and comments are appreciated.