Getting my first tri-bars

something like that, yes, could work.  Although it currently states it out of stock.  Like anything, going with a reputable brand name might cost you a few dollars more, but you end up with something that's often better designed, has more adjustability, pads may be more comfortable, etc.

you'll notice that there are a few different ways that the bars bend.  the straighter ones, I think called 'an ski bend' are sometimes (it really depends) more aerodynamic, but tend to be less comfortable for your wrists.  you might prefer more of a bend at the end, such as an S bend, or like these Stryke bend bars.  

imagine yourself holding on to those bars that you selected, versus these:

http://www.profile-design.com/profile-design/products/aerobars/aluminum-aerobars/zbs-stryke-bend.html

if you want to save some money, I'll bet you can pick up some used ones out of the classifieds either here or over on slowtwitch pretty cheap.  A lot of triathletes bought them for their roadie, then bought a tri bike and have them sitting around in their garage.  some might send them to you for the cost of shipping, just to get rid of them.  

oh- if you have carbon handlebars on your roadie, you may not want to clamp down on them, and might need the kind that mount to the stem.