The finance sector is producing top performers in diverse areas. And analysts say several still have legs. The broad sector has been catapulted by the Finance/Mortgage & Related Services industry group. That group has been ranked No. 1 among IBD's 197 industry groups for weeks. The finance sector is getting strength from other groups such as Finance-Investment Management. It's in the top 20, up from No. 74 seven months ago. Another is