I need help, My budget enables me to buy either the FS2 AV or the M72 (but I can't aford a sub), My room is of a average size. Do I really need a sub with the M72's ? What are the FS2AV like for quality and bass ? Which would be the best option ? I dont have the cash for the kef 2005's I'm thinking of pairing either set with a Marantz 4200 amp, would this be ok ?