A number of high-powered buyout firms are competing to buy Dell Inc. assets worth up to $10 billion, reports Reuters. The sell-off is being considered to reduce the amount of debt that Round Rock-based Dell will have to take on its books if its proposed merger with EMC Corp. (NYSE: EMC) is completed. According to the report, KKR & Co LP, Thoma Bravo LLC and Austin-based Vista Equity Partners Management LLC are interested in acquiring Dell’s Quest Software IT management division, and SonicWall,…