I really don't think that most people have the space and the resources at home to effectively use a sub. It tales a pretty good sized room to pull it off. If the room is too small, standing waves will kill you at the mix position, and you are right back where you started from.
Also, you need to be able to treat the room with diffusers and the like to keep low frequency resonance from building up and making the room sound funny.
My Events sound fine. I have really good D/A converters on all my digital gear, and a top of the line power amp, great wiring, and a room that is pretty flat. I can hear the low end about the same on my Events as I do most mid quality home systems.
Sub speakers are more hype than actual use, unless you have the facilities to use them right.
Also, you are not going to get a great sounding sub and a crossover for less than aobut 1k. All the cheap stuff out there sound cheap, and doesn't really reproduce the low end very accurately.
A friend that owns another studio that I work at sometimes bought the Genelec 3 way system. After using it in his room, I had to go back to the Events because he had so many problems with the room itself that I could not trust what I was hearing at all. At the back of the room, the bass was really big. But at mix position, the bass sounded hollow and non responsive.
Remember that low frequencies take longer to develope a full sound wave. If you want to hear your low end a bit better, move back to about 10 ft. from your good near field monitors. You will definately hear better bass response. I use this technique to see if I am mixing with too much low end. It is especially helpful for stuff that is below 80Hz.
Ed