Well, here is my suggestion.... all three machines below are made by Porter-Cable and are basically the same thing just different models. I know its not a pistol grip but its the "goto" machine for enthusiast detailers and even pro detailers. They are going to cost a little more but they are quality machines.
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Meguiars G100A Polisher - Lifetime warranty, 5 ounce counter weight, one backing plate and one pad is included -
Meguiars G-100A
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Porter Cable 7336 (considered a sander) - one year warranty, 6 ounce counter weight and you will have to buy the
Meguiars DA Velcro Buffing System(contains: one backing plate, two soft buff polishing pads and one soft buff finishing pad)
The Porter-Cable 7336 can also be found at Lowes for $90-$100
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Porter Cable 7424 (considered a polisher) - one year warranty, 5 ounce counter weight and you will have to buy the
Meguiars DA Velcro Buffing System(contains: one backing plate, two soft buff polishing pads and one soft buff finishing pad)
All three machines(the power unit itself)are basically the same. You
need to get Meguiars brand pads if you go with either Porter-Cable (7424/7336) version, do not use the included white pad.
The two different counter weights won't make a difference in the operation of the machines.
For the Meguiars DA Velcro Buffing System you will have to call their 800# as they are not online right now, the "system" runs around $32.00
Here is a great site to look over for more info:
Meguiars Online
Just my .02, hope it helps.