Welcome to the forum! Where do you plan on riding (road, offroad trails, etc.)? If you are on the road you might like a road bike better as the bars have more hand positions. I have the raleigh sojourn which is sold as a touring bike (usually designed for heavier loads and a more relaxed position than a racing bike) and have really liked it. I has space for bigger tires, fenders for riding in the rain, low gearing to help get up hills, and comes with a brooks b17 saddle which I have found comfortable. A pair of cycling shorts will help prevent chaffing and provide padding for your rear end. I have a couple of bibs from aerotech designs
http://www.aerotechdesigns.com/bibshort.htm that have served me well ( and they sell sizes that fit big people).
Good luck finding a bike and stick with it.