Guidance for speaker upgrade


Hello, I got some good advice here some months ago and added the VTL 2.5 to my system. I'm now looking at upgrading my speakers (Mirage M7 si). I have a Bryston 3BST, Benchmark DAC1 and Airport Express (I rarely use my Adcom GCD 600).
I really enjoy the wide soundstage and clarity of M7's but the bass could be improved. Room size is 10.5' x 24, unfortunately I'm restricted in placement to about 1.5' from front wall (long wall).
Any guidance would be greatly appreciated. Should I consider bookshelfs?
pjboud
How high are your ceilings?
Set up on short wall or long wall?
Opens into another room or sealed off?
Might want to add a high quality subwoofer. I own a Rel Storm 3, augmenting Intuitive Design Summits. Those already go so low that the crossover on the Rel is set at 27 hertz.