diet and training alone is the major key. the ephedra free thermo's will aid in giving you a kick in the gym, resulting in increased output and chances of overall more calorie expenditure. "fat burners" are no miracles to get you shredded.
now as for a reccomendation, I dont know, as I have never used any. Ill bump this up for you though

Definitely diet and training is the key here but the thermogenics will give you a kick in the butt.
In terms of fat burners, there are so many on the market now. Labrada Nutrition now has an ephedra free thermogenic called Charge. I myself prefer the ephedra based products but give the Charge a whirl, it's quite good.
Also, just a note. Be sure that you are eating six small meals a day, taking in adequate amounts of protein and be sure to include some EFA's in your diet as well. Hope that helps.

Ephedra free Dito would have to say Diesel Fuel. Also would echo above info from Fyre and Jen.

I've heard that green tea lowers test, so I don't use fat burners containing green tea extract, which many do.

But if you're on cycle, I guess it doesn't really matter...