Professional's Choise VenTech Elites for boots, I'm not a fan of others or polo wraps. Boots offer more support while polos offer almost no support whatsoever.. You also have to remember though that no boot or wrap can really support a horse, they are an added piece of equipment but they aren't fool proof and guaranteed to work.
I love the Classic Equine ESP pads, they're by far my favorite. I've also heard very good things about the Impact Gel and the Best Ever pads..Yes, they're pricey but you get what you pay for.
Like SH and the others have said, I'd look for used saddles..Buying a new saddle for that price and it being high quality isn't realistic. The cheapy saddles on ebay
Corriente makes custom barrel saddles for around $500 if you're interested in their saddles, I've heard great things about their saddles and a user on the forum (Posiedon) has one that she custom ordered and loves.