Thats quite a receiver you have there.
The Sony ES line is Sony's Higher End Line and along with having some extra features not seen on the normal receivers,they also use higher end parts in the amplifier section.
This allows them to have the ability to drive 4/6/8 ohm speakers without providing as Great of a Strain on the Receiver's Power Supply.
The measure of the speakers wattage is based on how much power the speaker can handle without damaging the drivers or crossover(s) in the speaker.
So any speaker that has a wattage rating lower then the wattage rating of your receiver you may wish to avoid.
You can still use those but you will have to be careful of how hard you push the volume on these speakers to avoid damaging them.
Like the others that have suggested going somewhere to audition several diiferent brands and types of speakers,I recommend the same.
Everyones ears are different and each receiver seems to blend with a particular brand of speakers better then others.
So,listen to as many speakers as possible then choose what seems to sound the best to you.
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