Um, how are bostons not good? Pro's are some of the best mid priced comps out there. IMHO better than JL's, alpines or infinity. I haven't heard DD or RE, but I would get another set of Pros in a heartbeat.
I would deffinitly recommend bostons over infinity anyday. Give them a little power and they will sound great. My pros took 100rms all the way up to 220 rms when I bridged the amp like a champ.