Mine is an aftermarket maintenance free floodie with a standard warranty. They probably do make one for the 2004+ models and would be cheaper than the other two options.
Those yellow tops do seem to be the cat's meow though. I have on in my van as the short run / backup battery. Got it free at the recycling depot.
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I have a friend who swears by them and has a 10 year old one in his truck. My electrak also has the X-large yellow tops which are probably 8 years old and still very juicy.
Does anyone have a long term report on the yellow top in a Prius?
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