What is your end goal? Budget? If your going down the PA speaker route, SD amps should be your #1 choice.
SD just came out with a amp that doesn't require a DSP. No reports out yet that I have seen. SD is a big player in the bike audio comps. Tons of clean power
Do yourself a favor and listen to as many bikes as you can.
2009 Road Glide. 16 in Vindikta Wild Cats. Aquatic AV, Stinger 700X4 to MMatts, Audiopipe horns.
6900pros in the lids w/ sspn.4 1000d, tuned with DD Audio DSI-2. S&S 106, lifters, push rods and AC. Drago 2. CycleRama 575. Progressive monotones -1in. 12in. HD adjustable rear shocks. Painted inner fairing. Tuned with TTS. Blacked out!