Speakers with built in sub any good?

Speakers w/ built in subs that sound good to my H ears are pricey (Genesis, Audio Physics, etc). Agreeing w/ sugarbrie regarding a separate sub, I'd add another option: Audio Physic's "Step" + sub. BTW, how big is the room??

Artemus, don't think the Step will fill yr. room. I second Doug's suggestion (Thiels). In my experience, they need very careful positioning, otherwise U get too MUCH bass -- but yr room looks fine on screen for them. Also, Thiels are power guzzlers, as Doug says.
The Genesis V or 500, with a servo controlled, built-in sub, are usually expensive used (BUT, U never know...). It takes time to fine-tune them, but the rewards are very good IMHO, especially in as long a space as yours. I have them and am very happy with them. They too, like amp power.
Any way U can audition some products? To get a feel of how much better (or worse) the sound gets vs. yr present gear...