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v twin is a slanted two cylinder (similar to a harley) they are only in crusiers.. >>
Uh, nope. Ducati has been winning world championships with a 90 degree twin for years now. They actually don't make anything other than twins and they don't make cruisers. The main diff with the sport twins and the cruiser twins tends to be the angle between the cylinders: cruisers are generally narrower (easier to fit a narrow twin into a frame) as they don't rev nearly as high as the sport-twins so you don't have problems with the bike shaking itself to bits. Most sporty twins are 90 degrees as this gives the engine perfect primary and secondary balance, but at the expense of being hard to "package" and get the front/rear weight distribution set up well for racing.
Anyway...on to the questions:
1) Main things to think about for a first bike (IMHO). Plan on spending anywhere from $750-2000 for a decent first bike. I personally think it's a good idea to go with a standard-type bike with minimal plastic bodywork as the odds are you'll drop it once or twice (usually when maneuvering in a parking lot or something like that). You don't want to spend a ton of cash on a first bike as you'll outgrow it pretty quickly and want to move up to something bigger once you've gained some experience.
Any of the main Japanese brands will be fine, all are quite reliable and you should have no problem finding part/service unless you get something rare.
Examples: Suzuki GS500E, Yamaha Seca/Seca II, Kawasaki Zephyr, Honda CBs, etc. Keep it under 600cc until you have plenty of miles logged and are ready for a bigger bike.
2) I personally don't like 250s as a first bike, they are scary on the highway as they get blown around a lot being relatively light and small and don't have enough power to get out of their own way at highway speeds. Anything closer to 500cc should have around 60-70 hp and be decent on the HWY but not so powerful as to get you in trouble. I had a Honda VF500 for a year and then went to a 750, then a 900.
Also: Don't skimp on protective gear. Full leathers or an
Aerostitch suit may be expensive and hot, but are better than skin grafts when you toss your bike down the road. I lowsided my Triumph at about 50 and walked away with only bruises thanks to my leathers. Don't be one of the dipsh!ts I see here in Atlanta flying down the interstate wearing shorts and a tanktop....you really don't want to see what they look like when the arrive at the emergency room...believe me.
Good luck,
Fausto