recently acquired some L80T speakers with T3 crossovers... looking for a few used power amp recommendations that would work well with these speakers... figure $500 or so, wish I could go higher but I'm spending more on this audio system than the wife would like... what is the minimum watts per channel I should be looking at...

second question - can I use my NAD C320BEE integrated amp as a preamp, or is it better to have a separate preamp matched up with a power amp... thanks in advance for any help.