If you like something with a little action, I'd strongly recommend the two that are on sale from Adrian Magson: Red Station and Tracers. I just discovered these this year through my library and really liked them.
Actually, I'm lucky that my library carries a lot of the Severn House titles - after I put together my original 24-title wishlist yesterday I went back to the library catalog, and now my to-buy list is down to about 6!
I really blew out my budget during the Open Road & Bloomsbury Reader sales...