So shoot...tell me what NOT to buy and what to go with

I have a sump with a dedicated skimmer area

I can do hang on
In sump
hang on tank
just not in tank

My tank is a 125 but with the rock sandbed and the sump i have almost exactly 100 gallons of water to be skimmed

so suggest away

the last skimmer i bought for my 20 was a disaster (fission nano) so i need better advice and would prefer something that really pulled crap out of the tank

I am going to buy one tomorrow when I go to Austin

If you have one to sell feel free to PM me...I am open to the idea...if you are farther than Austin to the Fort Hood area...I can't drive to pick it up though..but I do have paypal and I want it soon...my tank needs it

THANKS!!!