The link worked for me in Australia. Interesting site, some of those could be worth it for the table and legs alone! Mark, until you have a lot more knowledge about machines I'd suggest you give places like that a miss, too easy to get caught out. You are going to be faced with the same unpalatable truth that many face when starting out - to do what you envisage you'll likely need more than one machine. For the lighter stuff (and might include the chaps, I'm not sure about them) the usual upholstery class machine with 3/8" under the foot and up to #138 thread should suffice. If you intend doing horse tack, which sounds highly likely, then you'll probably need a harness stitcher too (heavy duty sucker!).
Having said that, a Cowboy 3200 might come pretty close to doing almost everything, depending on how heavy the horse tack is likely to be. Unless you want to invest a lot of time to learn how to adjust and maintain an industrial machine I'd suggest you consider buying from a reputable dealer who can give you support, whether you buy new or used. There's lifetimes of knowledge and experience on here (not me!) so you've come to the right place to point you in the right direction.