I would check out the kGo and E-Power. Both are 3.7V PVs instead of the 3.3-3.4V that the eGo is. They both give a great vape and have really good battery life.
I use an E-Power and love it. The main difference for the E-Power compared to an eGo/kGo/Riva is that the E-power uses non-proprietary batteries. E-Power batteries cost $4-5 compared to eGo/kGo/Riva batteries that are $14-20, and they last longer before they need to be replaced. Also everything is replaceable on the E-Power, unlike the kGo/eGo/Riva. The E-Power batteries are 1050mah so they last a long time and I get on ang a day to a day and a half on one battery. I also find it much easier to carry a spare battery for the E-Power bc their about the size of a AA but alittle longer, and if needed just unscrew the switch and pop in a fesh battery. With an eGo, kGo, or Riva, to carry a spare you have to carry a second PV bc the tube, battery, and switch is all one unit. The E-Power is very affordable and comes in a variety of colors (black, SS, titanium, crome)
The kGo is also a really nice PV, even though its a proprietary battery PV. It gives a great vape and has an 1100mah battery so it lasts a long time. The kGo is also very affordable and comes in a variety of colors. One of the colors in pink, but you can also get it in black, crome, and SS