Rainbow are indeed pretty good. The only thing I would say is that they can tend to be a bit power-hungry, in as much that some of their speakers do take some significant welly to drive them - look at their nominal/RMS (not maximum) power rating, as this is the RMS figure you should really be 'feeding' them with.
If this is vastly different from what you can deliver (ie, if they need 80wrms, and you're looking at giving them maybe 20wrms from a 50w max head unit) look elsewhere, or purchase an amp to drive them - under powering a speaker is just as likely to kill it as over powering it.