Would an EQ help? Newbie please help!

Hi,

so I'm trying to put a home studio together:

got a pair of Alesis M1 520's (best you can buy for $200)
http://www.zzounds.com/item--ALEM1ACTIVE520

with a Behringer XENYX 1002 Mixer ($69)
http://www.zzounds.com/item--BEHXENYX1002

So, I hook everything up, I plug in a cd player, and I see (ok, I
'hear') lots of detail and all of that, acoustic instruments sound
very detailed and I'm happy, BUTplaying with other kinds of music
where did the bass go?

So I got a subwoofer from FOSTEX, it was too boomy in the low end, I
needed more bass in the lower/ midrange (I don't how else to expalin
it), so that going back!

Then I thought, can an EQ help fill those parts of the sound spectrum
that are missing?
http://www.zzounds.com/item--PRSEQ3B
($99)

What's your take when you're using Monitor speakers? In your
experience would and EQ help balanacing things out just for listening
music? I know that monitors are suppose to be flat.

Any input is much appreciated.

Thanks,
Alex