If you're looking for high efficiency and low weight, you definitely need to check out the Optimus Crux Weekend HE Cook System.  The Weekend is a compact and light weight cookset featuring the Optimus heat exchanger that reduces boil time by up to 20% while actually reducing fuel consumption in the process. 

The Crux Weekend HE includes the folding Optimus Crux stove.  This awesome stove features an extra large flame spreader to evenly disperse heat and large pot supports for steady cooking.  It cranks out 10200 BTU, enough to boil a liter of water in only around 3 minutes, but the Crux has yet another claim to fame.  It folds up small, we mean really small, just a little larger than 3" x 2".  And the whole kit with stove weighs only 9.7 oz!

The main cooking pot of the Weekend HE is a 0.95 L saucepan offering the strength of hard anodized aluminum.  It includes a pouring lip, measuring marks (mL and oz) and attached handles that fold neatly against the side when not in use.  The frypan is of the same durable construction with attached folding handle and doubles as a lid for the pot.  Both items fit neatly in an included mesh stuff sack.  There's even room inside for a 230g fuel cartridge and the Crux Stove so all of your cooking gear stays together and ready to use.  The kit also includes a neoprene sleeve to hold the stove and protect the pot finish.