Folks/Experts out there,

Need some help with choosing speakers!.

Currently, I have a pair of B&W 603S3 and am driving them with the NAD C162/C272 pre-amp/power-amp combination. Although I am very happy with the current set up, I feel that it does not give me the low end I am looking for. The bass just doesn't seem to be enough. I listed to all kinds of music ranging from soft rock to country to classical.

I am thinking of upgrading the speakers and am thinking about the following speakers to help me out on the bass front.
Energy RC70
B&W 683
Paradigm Studio 100

Is there any other way to do this without spending a whole lot of money on a set of new speakers.

Thoughts will be appreciated