To me the most melodic CD's by Helloween is Chameleon & Pink
Bubbles Go Ape these are generally not well liked by Helloween Fans who
prefer the harder side and not so varied music as on these two CD's.
The Time of The Oath,Master of The Rings,Better Than Raw are very good
with Raw being the heaviest. Their earlier CD's Keepers of the 7 keys Part
I & II are also very good.

Also try the group Gamma Ray which have a new double digipak collection
with all there best songs rerecorded for like $16 bucks Its a great package.

I always thought Helloweens 2 lead guitarists are way above the pack, to me much better than Iron Maiden's guitarists.