I would get speakers that can handle your stereo RMS of 52wattsx4. You want at least a 60watt, maybe 55watt RMS speakers. I went with the California made CDT based on audio store recommendation that had many manufacturers. They have versions of 60watts and 110 watts, for about $100/pair. Great speakers. They replaced my blown Infinity Kappa's. The CDT's are clear and crisp because they come with a separate cross-over module for the highs.
I had to get the 110 watt version because my amp is pushing 100 watts RMS per channel, not including the 500watt sub channel.
These are the guys that I purchased my speakers from. I got my EQ, Power Acoustik Gothic 1500 watt amp, 10" sub-woofer loaded MTX Thunderform, and my speakers from them. I already had my head unit. They are a short drive away from you and very friendly. You can purchase and pickup right there at the warehouse. You can order online too, but I was impatient and they are so close. But, use your own installer. The guy they sent me to did a really sloppy job.
But, they were great and replaced his mistakes without question.