what bike to buy: road, cyclocross,touring
I hope this is the right forum for this question. I have read past threads on the road vs. touring vs. cyclocross but they all seem a few year old. First I'm trying to buy my first ever nice bike but I'm stuck on what to purchase since I bike soo much. I have two bikes form the 1980s that I use for commuting rather than a car and I just completed my first full triathlon on a 1985 Norco road bike in 2:53. I did about 50K rides along country roads this summer and I'm thinking of doing a few ~ week long tours. I also would like to do some occasional triathlons and have a bike that I can go fastish on. I'm 5'8" with a 31" inseam, 145lbs.
As I see it, I can either by a less practical fast road bike and use my Norco for commuting and possible touring. However, the Norco lacks the attachments for paniers. If I buy a cyclocross I can take it on the country roads but I'm afraid it might be slow for racing and I'm not sure about the durability for long distances. Also whatever bike I get I want to ride it regularly and I'm worried about a very expensive bike getting stolen (I've had 4 broken down bikes stolen!).
I'm looking at a Lemond Buenos Aires but its a steel frame and I already have a steel frame bike. I've tried a Surly long-haul trucker but the frame feel very upright and I didn't think I could get it going very fast. I've seen recommendations for the Bianchi Volpe, Axis, Kona Jake and Crosscheck but I don't know if I'm going to have the chance to try all these bikes. I'd like to figure out whether I should be looking for a road biked (trek, giant), touring (Devinci, Surly) or Cross (Felt, Surly again). All comments are appreciated since my mind is full of bike types, specs and brands.