First, bummer to hear about your sheepskin pad! I have a merino seat saver for my wintec dressage (the saddle I do most distances in) and a full merino cover for my western style endurance saddle. I wash them in the washer, but let them air dry - so far, they've held up! But they sure do stink like a dead animal when they are wet! LOL!
I use different pads by Toklat - the coolbacks are nice, especially the thicker ones. I make my own english pads (I like clean pads for every ride so I made quite a few) but my favorite has to be general synthetic fleece - I sewed 6 layers of fleece (or 4 layers of double sided fleece) and it works GREAT -just the right thickness, doesn't slide, breathes wonderfully, doesn't build up heat and soaks up a good portion of the sweat. Washes up in the washer and is new again.
I agree about mohair - I have them both for my western and my dressage saddle. I also use a synthetic (it's poly, not neoprene) girth for the horses who can't survive a string girth and they work well, too - the poly girth holds my heart rate monitor on really well - no shifting.
Fyi - there is a difference between the english fleece toklats vs the toklat regular woolback - one has a different type of 'pile' than the other and varies in thickness as well - I don't remember which, but worth researching before you place a $100 order.