Another possible source for additional/different Perry details:
The newest Squadron flier (Feb, 2010) lists a Republic of China Cheng Kung-class frigate by AFV Club (1:350 scale). it is described as containing a full hull with separate bilge keels. S-70 Seahawks (1 with folded and 1 with extended rotors), name plate, display stand, resin and photo-etched parts. Decals and painting instructions for all vessels in the class. ACS735S1 MSRP 94.00 Price 59.99.
The resin & photoetch make it not the Academy Perry, reboxed. The MSRP is also twice (+/-) the Academy.
AFV Club makes some particularly nice 1:350 scale submarines. I would like to see what they've done with the Perry (Cheng Kung), but not at that price/not right now.
EDIT --
I googled around a bit and found this. The PE looks to be new lattice-work for some of the masts & platforms, new radar, new waist decks and railing/helo deck netting. The resin looks to include a couple of box launchers aft of the bridge and some 40mm guns on the new waist platforms. You're not going to be able to make an Adelaide out of it any easier than the Academy kit.
On the other side, comparing what you get with the Academy Perry for its price and add the price of an aftermarket PE set, such at that by White Ensign, the AFV Club sales price (not MSRP) is probably in the ball park of cost for value.