question about receivers,wattage and subwoofers

[commandercool]

ok so i'm not going to purchase a receiver sometime in the coming months along with new speakers and what not but i've always wondered i know on a lot of receivers otu there they give out about an average of 100watts or so per channel so lets say i pick up an onkyo 606 would i need to match each speakers to the wattage of the receiver or can i just get like any speaker that's like 200-300 watts each? or would i have to go by the ohms? also does the sub need to be a certain type of wattage too or can i throw just any sub in there with the mix? i'm just asking before i prepare to build my ht because i like my movies and mostly music(what i'm going to be using the ht for mostly) really loud which reminds me lol one more question sorry guys

is it bad to play your ht close to full volume for music and can you blow the speakers out if played too loud or hard? thanks