Opinions on what is a collectible drum can certainly differ.
I have a few kits, but more snares.
The snares I am looking to collect are 1960's "professional" models from the American drum companies.
I have a nice 7 line Dynasonic, an early Camco Tuxedo, an early `60s Slingerland brass shell model with 3 point strainer etc..
All these snares are within the 300-500 range.
Mike C collects much nicer drums than I do.