you can buy the Peak lights here,
http://www.peakledsolutions.net/
and here,
http://www.pocketlights.com/flashlights.asp
and reviews can be read here,
http://www.candlepowerforums.com/vb/forumdisplay.php?f=19
and here,
http://www.ledmuseum.org/
i have both high and ultra-power matterhorn. though i've never EDC'd the light before and only played with the high-power matterhorn around the house i have to say its a great little light. the new version head will have more flood then the old style head. it's safe to use regular, rechargable or lithium AAA battery. this light will put out more light then the current ARC 1AAA with single LED.
as for recommending other AAA light(s). i'll leave that to someone else to say that own more then i do, but i was looking to buy the Peak Pacific for my uncle. the 1AA body will give you longer runtimes but of course a fatter body. it's also brighter.
something smaller but alittle fatter then the 1AAA light, i've heard good things about 1 cr2 or 1 cr123 battery lights. the cr2, cr2 ion, orb raw, orb raw ns, fenix p1, fire fly and jil are just a few that i can name right now. of course there are more lights i'm missing but you can try doing some searches for more info then i can give you. there are LOTS to read. i stayed up all night when i first found CPF trying to skim through about 2 years of postings!
BTW, welcome to CPF! and as many will say, hold on to your wallet!