Stereo-in-Dash has the best reputation in the area - so much so that some of the Cincinnati Reds players bring their vehicles up.
They do big custom installs and are the best in the area... Try to talk to Brock or Tony if you can, Jason is the "old timer" who's been around the block owner, but is a little out of touch.
If for some reason that doesn't work out for you, California Custom Sounds is the next option... but it's not a close second!
Car Stereo Max is a joke, bad bad bad installs (over torquing screws and ******* up speaker trim bezels, wiring clumped like **** and hissing), overpriced and I'm not sure how much longer they're going to be around.
Avoid Best Buy, H.H. Gregg and the other big box retailers.