Best 6.5s speakers for about $150/pair?

Hey guys, time to replace my 6.5s and I'm on a budget of about $300 for all 4. My boat sits in the water covered, do I need to go with marine lines, or based on current manufaturing of car speakers being mostly rubber, should I be okay with car stereo grade? Can you guys shoot me some links on Best Buy's website that you would recomend? I have gift cards for them...

Thanks!