<font color='#8D38C9'>I highly recommend the Behringer DSP-1124. It has a 10 band parametric eq and can store 12 preset settings. The unit is very flexible and powerful, and pretty affordable. You can usually find one for under $140. Be aware that it has only TRS & XLR inputs- you'll need some adapter cables or plugs. Don't worry, though, both are cheap and readily available.
My advice? Get a Radio Shack SPL meter and the Rives Test CD (it's already got tones with values corrected for the known deviations from flat of the RS meter). Get a peice of graph paper and from the spot you'll be doing the listening (aka "the money seat"
plot the curve of your room. Choose a volume setting and leave it there; you may later change it & remeasure, but leave it the same til you're done. Then make your adjustments and plot it again.
You'll never get the deep bass completely ruler flat, but you can make it a lot better. Don't attempt to EQ out dips, it usually isn't practical/possible. Use the Parametric EQ function only on peaks; they're more noticeable anyway.
I don't know of any affordable EQ that will do a better job. Parametric EQ is the best kind of EQ, much better than the graphic EQs with the sliders. It allows you to choose the "Q" of the boost/cut, as well as the width of the notch. A graphic EQ will only boost/cut on the center that's represented with a slider- with that type you choose only the amplitude.
If you don't wanna mess w/parametric EQ, for about $300 AudioControl makes a nice 1/3 octave graphic bass EQ in their Richter Scale. Not as precise but a bit easier to use.
Hope this helps.</font>