your range is $800.00 are you going with a intel cpu ? or AMD
also what kind of case are you trying to use mid size atx or full
what kind of games will you be playing GPU inportant part as well Nvidia or amd
also Psu has to be enough to power everything especially if you plan to over clock
if you are going with a regular HDD or SSD/HDD ?
alot of questions need to be answered