I'd start with a JBL MS-8 for DSP. Your budget allows for it. This is coming from someone who has the LC6i. Trust me, you will want more. The LC6i does great for what is was intended. It's noise-free, provides REM to amp, and provides a full-range signal to the amp. However, the OE signals are so horrible! They need a lot of EQing. I've tried summing front mids+front tweets+sub, and front mids+rear mids+sub. Each provides different sounds, but none is great. I know the MS-8 sounds like a lot of $, but you can get new ones in the $400 range, or slightly used in $300-range. In the end, it's not much more than the LC6i + additional AudioControl EQ (EQL), and you'll have way more features. The MS-8 can power your rear fill, and center channel speaker. It has built-in 8 channel amp.