I'm thinking about selling my RF Power series comps (they don't fit in my doors). They are 6.5" and would come with MB quart crossovers instead of the RF ones (RF ones were stolen). Price would be 150 shipped to you if interested. 50/60w really isn't enough to make the mids sound fabulous, but they'd be heard nonetheless. email me at wbrandonp@yahoo.com if interested. if not, good luck!
I have K2P in the front and the rear is dead. I have some cheaper coax in the back, but they aren't even heard since I cannot power them without them distorting. I have 450/4 and was just looking for something versatile for the rear that I could mostly go mid bass and a little bit of high... I want quality as much as anything which is why components come to mind.
...so I was thinking 450/4 with 125-150W K2P in the front and some cheaper components at 50-60W in the rear.
This should be OK as far as I can tell.
I suppose that coax that could handle 50-60W and sound good would be fine too.