Honda is moving Acura along the socio-economic ladder, and unfortunately for RSX buffs, the brand is quashing its relatively inexpensive coupe its way upmarket. By the end of the 2006 model year, the RSX will have ridden off into the sunt. The move is rather predictable, given that not only is parent Honda keen on moving the brand to a higher rung, the redesigned Civic Si outpoints the base RSX (197 horsepower versus 155) for a c-note less. So... will something come along to fill out Acura's low end? The automaker won't elaborate, but dealers say that a coupe and/or convertible TSX could be in the cards.