I like PLUG as they are near profitability and have a huge opportunity in the automotive sector. They make fuel cells for fork lift trucks.
I also like SONM. The make ruggedized cell phones for public safety and construction, etc. but have taken big hits recently.
And I like OPGN. They have a diagnostic tool that determines exactly which antibiotic-resistant infection a patient has (in 2 hours) so treatment begins sooner rather than later (lab tests take 3-4 days....which is too late). The have submitted their 510(k) submission and should get approval any day now.
McDee