For long sport climbs in the east, there's always poko. It's got kind of a rep for scary routes, which is largely unfounded on the newer routes, but they start at 5.10 for the most part--there are a few really good 10's there, some that involve only the occaisional gear placement. Also, the south wall at whitehorse has some pretty sporto 10's, including last unicorn and science friction wall. Potrero and red rocks are both hotter than a...they'll be really hot in summer. There are some long (500'+) sport climbs on the limestone areas outside of Vegas though, that are much cooler--One in particular follows the line of the ice route "vegas hose-monster", but it's like 11c. Wasn't there an article in one of the climbing mags recently about long clip-ups?? Not too many in the 5.10 and under range that really qualify as sport climbs, and most of those were in winter-only climbing areas.