The perfect touring bike depends on what kind of touring you want to do. To some people, touring means crossing the country on a freeway. To others it means taking secondary roads, exploring little nooks and crannies, camping out, etc. Different strokes for different folks.
I have never been a cruiser person. I don't like the seating position with the high handlebars, the low seat, and your legs out in front of you. But it's just a matter of personal preference, or what you're used to. I rented a Harley for a day last year and totally loved it. It was a Heritage Softail, probably the most expensive model in their lineup. It was VERY easy to manage despite its intimidating weight and bulk, because it had such a low center of gravity. And on the road it was wonderful--comfortable, stable, low-stress. I could have ridden that bike across the country easily. It wasn't the best for the little narrow mountain roads I love so much, but it would make up for it on anything where you could go 45-50 mph or more.
I know they make more purpose-built tourers, like the Road King, and I would guess they are just as nice on a long trip. And though I still don't prefer that riding position, it's comfortable once you get used to it. And I really think Harleys are beautiful and 'classic'.
As for clothes, when you tour on a motorcycle you have to learn what's important to bring along and what isn't. You don't wear special clothes for the bike, then take them off when you get off the bike. You wear a jacket and pants that are good for riding but also good for walking around, this means no full-body leathers or anything like that. I bring two jackets, leather and mesh, and a sweater to put under the leather jacket, and then I'm ready for the full range of temperatures. Also two pairs of gloves, light mesh gloves for hot and thicker insulated gloves for cold. And, of course, a rainsuit that rolls up small. After a few simple weekend trips you quickly learn what you need and what you don't, what works and what doesn't.
Texas in the Summer can get very hot and dry, so you might also look into one of those vests that you soak in water and they keep you cool by evaporation. And remember that your own sweat is cooling you even if you don't feel it on a bike because it evaporates quickly, so hydration is very important. Drink a lot of water, or even get a 'camelback'.
Touring Texas on a Harley is almost an iconic motorcycle experience. 8^)
