custom loop is best. Price based on what you want. CPU block goes $75-100. Depending on how many radiators you want and what size figure about $75-125 a piece, pumps depending how many and how good factor $50-250, reservoir depending what size and style I guess $20-100, fittings about $5-10 a piece x how many you need ( I needed about 20, tubing depending what size, total length, and colars $20-50, fans depending how large you radiators are $20-30 a piece, then add in extras such as lighting, thermostat, monitors, fill/drain valve ect can run you another $100, if you want ridged tubing that could run $100-300, gpu water blocks around $50 for universal or $100-150 for full water blocks.