G2 Copper Glow
G3 Starcatcher
G3 Waterfire
G1 Fizzy/Galaxy (tied!)

Hm, let's see...

G1: I'm a young one, so I wasn't yet alive when G1 existed in stores. I did find the Dream Valley website at age >10 however, and would literally spend hours admiring and memorising the G1s. They were like soe kind of vast, unreachable treasure to me, as they all looked so different and amazing. Even today I'm in such awe of them that I could never customise a G1 - and I kinda cringe slightly when I see others doing so. To me, they're these amazing treasures.

G2: It started the year I was born, but I was unaware they existed in my childhood and thus only discovered them (again) on Dream Valley and liked how many little acessories they came with. I thought they were so elegant and dainty when I saw owners photos of them, and was amazed by their colour palette and increasingly questionable naming schemes. To this day they are my favourite generation <3

G3: The generation I grew up with, my first pony was Star Catcher and I got her on my 5th or 6th birthday, from memory, quickly followed by Thistle Whistle, Blossomforth and Spring Fever. I spent all of my pocket money on them, and soon amassed a collection of 40-50ish I don't actively seek them out, but I still love them for the nostalgia value they have for me!

G3.5: I hated the lack of new characters and in general how odd they looked so I only own one who came in a lot....

G4: Again, I dislike the repeating characters and how un- dynamic the poses are. They're also too small and hard

The most common Novi you have there is Ali, followed by Una, who is ever so slightly more pricey. I wouldn't say more than $15 for them (although I'm referring to the aussie dollar here!). Ann is much harder to find, she's in the $45ish price range from memory?

Some of the other G3s had this hair problem besides just the Avon ponies.  If I recall correctly, some of the TRU exclusive sets also had terrible hair problems....

Princess Peppermint's hair comes to mind - it's white but it has the same problems as the light pinks that disintegrate.

My G3 Blossomforth (the version that came with Spring Fever), who was one of the first ponies in my childhoood collection, had this problem - her hair crumbled and fell out entirely!

I'm Australian! The only problem is that I'm also looking for Mary for my own collection.... If I ever manage to find two (let alone one!) I'll let you know Sorry I'm not too much help though...

When G4 first began I ended up buying all of the brushables I could find, but I simply haven't clicked with them and am now considering selling them. All of them are in mint condition with all of their acessories/pets.

(The Mane Six - 1st edition with forelocks)
Twilight Sparkle
Rarity
Rainbow Dash
Pinkie Pie
Fluttershy
Applejack

Sweetie Belle (1st ed. with forelock)
Blossomforth
Cheerilee (1st ed. with forelock)
Cupcake

Have you seen the page that their creator did about them? It's very interesting to read

http://melbirnkrant.com/puppy/index.html