Mehul,
Is your interest primarily in boxes or single examples?
Also, are you looking to collect sporting rounds only or the whole gamut of cartridges?
Originals only or modern loads of classic cartridges?

As you know, once you get started it can get hard to pull the reigns back - there will always be some cartridge you don't have or simply don't know of.

I can spare a few rounds, so do you have a "wish list" to get your new hobby off the ground?