newbie seeking stereo system advice

hello - i have recently began to purchase my first decent stereo system, actually to me this would be a great stereo system as i have been accustomed to junk hand me downs from best buy and the like.

so i purchased a roksan kandy integrated amp and a pair of axiom m60 speakers and i have been pleased with the result.

now i am looking to take a "next step", i am looking to get a little more power (in my terms, that means i would not have to make the amp work as hard to get the volume level where i want it) i do not know if this is an accurate assessment

finally to my question(s), would bi amping be a logical next step? if so, could anybody recommend an good used amp to look out for, unfortunately, i need to stay around the $400 range

thanks in advance for any suggestions and bearing with me through i am sure are rather too general or ridiculous questions

sean