HHHMMM. Hard to say. If you were in the US it would be easier for me as we would be looking at the same stuff. But for some odd reason when I search for those speakers the only sites that have them are in the UK. I would think that 45 watts RMS is not realy enough. I would try for 100 watts, ideally you don't want to be at more then 80% of full power for anything (speakers, amp, or head unit) if you are having to turn it up all the way now then even with better speakers the amp may not be enough. what about making boxes for another type of speaker, so you could try a different size ( 6"x9" is very common over here) that can handel more power.
Don't forget to
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first then ask questions later! The loose nut behind the wheel