I have a 2006 Sportjon with about 200 hours on it. I'm thinking it may be due for a new impeller and sleeve. I have been satisfied with the performance of the stock impeller so I don't think I need a high skew replacement. I do not want to lose top end speed and diminish my fuel economy. I've heard of UHMW sleeves. Are these superior to the stock sleeves? When I order a new impeller and sleeve, are there any other parts I should replace while I've got it disassembled? Who offers the best deal?