Cutting this list off at 20 was pretty difficult, but this represents my favorites.  I, too, tried to stick to a "power" pop theme with this list, but some punk/new wave-ish albums do sneak in there...
 

Cheap Trick – In Color
Big Star - #1 Record/Radio City
Jellyfish – Spilt Milk
Teenage Fanclub – Bandwagonesque
Beach Boys – Pet Sounds
Elvis Costello – This Year’s Model
The Posies – Frosting on the Beater
Beatles – Revolver
Weezer – Green Album
The Cars – The Cars
XTC – Skylarking
Fountains of Wayne – Welcome Interstate Managers
DBs – Stands for Decibels
The Raspberries – The Raspberries
Matthew Sweet – Girlfriend
The Shoes – Boomerang
Sloan – One Chord To Another
Badfinger – No Dice
Flamin’ Groovies – Shake Some Action
Jason Falkner – Presents Author Unknown
 
I don't really like to do honorable mentions or bubbling unders, but if there was one that probably should be #21 it would be Let's Active - Cypress.
 
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