The DBX 234XS is the best overall choice I know of. At $319 it supports 2 X 3-Way channels if need be with easy setup. It uses the highly desirable Linkwitz-Riley 24 dB/Oct filters, which generally aren't used in passive designs because of parts count and cost issues. Its only drawback is the use of XLR balanced connectors, so you’d need 2-RCA to XLR Male for the input, and 4-XLR Female to RCA Male for the outputs. The DEQX Pre-8 looks awesome, but it definitely won’t be cheap.
