found it;
38511092 - Evenflo Momentum 65 LX Convertible Car Seat 139.99
+1 on the quality of the car seat, but -1 on it being lightweight. Walmart lists the shipping weight on the Scenera as 11lbs and the Momentum as 25lbs. Granted you're not going to find a full size convertible at 11lbs, but I don't think the Momentum is exactly lightweight.
I have the Symphony, which is basically the same as the Momentum except it adds a booster mode. The LATCH connectors are fantastic, they click in easily and you just push the whole seat down to tighten it (there's some sort of automatic crank), then press a one touch button to release. Still not sure whether it was worth the extra money over the Momentum, but it has since been paid for by insurance after a near standstill accident, so at this point I don't really care.