Speakers are a very personal thing everyone wants something different.

I suggests looking at other user's setups and checking out other rides first before dumping the cash in your ride.

If all you are looking for is a deep bass hit.

Buy some drop in easyfit type speakers from crutchfield run them via the HU.
Get a head unit with a set of pre-outs, get a monoblock amp, something like a JL Audio 250/1 or 500/1 and a big 12 or 15" dual voice coil sub.

And lots of sound deadner, else you are better off to check out some systems in person before dumping money into the Accord.