I currently ride with some cheap pad I ordered on a whim and I am in love with it!
Here is the link to that one --> Performer's 1st Choice Contour Western Pad - Black - 32" X 32" Technically Advanced Saddle Pads Western HorseLoverZ.com
I have had other pads in the past like the ESP pads by Classic Equine and the SMx H.D. Air Ride pad by Professionals Choice but have found they can get very loaded down with sweet and they are much harder to clean making them heavier.....I do like the support they offer.
I will probably stick with the pads that have the Neoprene bottoms because I just really like the way those are working for my mare and they fact that they are light and easy to clean....just a rinse of the hose does the trick.
I was considering getting an Impact Gel pad but they are so heavy and then the talk about them getting hard kind of sealed the deal for me to stick with what is working for me right now.
I would def recommend most pads with the Neoprene underside, I say most because some I have seen are very thin.