You may need to go with a tube mod, like the SmokTech Bolt or something. 3.7v at 1.5 ohms will net you only around 9 watts though. Here's an example
The BOLT ECIG by SMOKTech
For variable voltage, you are stepping up in price but have more flexibility in your desired vape. The LavaTube would be an example of a VV tube mod. With that you could turn up the voltage.. to say 4 volts and get you a good 11 watts with regulated power.
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Basically whatever you can fit a AW IMR battery into. I don't think the stick eGo type batteries were made for vaping at 10+ watts. They would be the cheapest entry, and a VV eGo like the Twist or the Vision Spinner could get you your 4+ volts, but will they die like your last battery? Maybe so.
There exist knock-offs and derivatives of the Bolt and LavaTube that may run cheaper. Tube mods are nice because when the batteries die they are replaceable, without replacing the whole mod, which will save you $$ down the road.
Maybe someone else can chime in with ideas/opinions