If you believe the specs, your speakers are good for 250W continuous each so yeah, you could make use of a larger amplifier. 500 W per channel would not be an unreasonable match. I'm not sure the specs are believable though - the speakers only have 6.5" drivers. Moving up in wattage may just make smoke.

You are considering doubling power to 200W. Blackraven has suggested 130W. Neither of these upgrades is going to give you an obviously louder system. You need 10x the power to make a system sound twice as loud.

To get to the point where you apparently need to be where your ears blow before the equipment, you're going to need to buy some amplifiers and probably some speakers too.[QUOTE
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It's of no consequence, but I've heard that it takes 10db for the human ear to percieve the sound to be twice as loud. Ham fisting 500W into 6.5" drivers would be fun for the first 30 seconds anyway Forget about compression, it'll melt.