Definately get the 6.5" comps, they'll have a bit more midbass most likely, and overall output should be a bit more then 5.25. You can buy an ABS plastic adapter a few places online, or make one yourself if you have a few tools and skillz. Now as far as reccomendations, i don't think that is our job right now honestly. First, search around for "6.5 components", things along those lines, and THEN and only then should you make a thread/ask questions regarding what speakers to actually get. Their are many many different brands of components we will reccomend for you, but your best bet is to search for awhile so that you won't get just a few, possibly biased, opinions on this thread only. It was a good question to ask, but now that you know most of us will agree on the 6.5" size/baffles/adapters, use that "search" button for awhile and we'll go from there.