MOTM

>Considered Martin Logans, but am worried about placement issues.
>These are going in my lab which is cramped (around 13 x 15) and
>these have to be against a wall.

Mmmmm..... Martin Logan Sequels.  But if space is a concern I
whole-heartedly recommend the Totem Arro:

http://www.totemacoustic.com/Arro.html
http://www.soundstage.com/revequip/todd28.htm
http://www.audioreview.com/reviews/Speaker/product_8511.shtml

Or if you want something bookshelf sized locate a pair of used
Totem Totts.

-Cary