1. Cheron
Not quite my body type tbh (eg her calves are too chicken leg thin FOR ME) but the B2B is/was insane. Her boobs are comfortably among the best I've seen aesthetically, and I rate them above Milena Velba's both in terms of aesthetics and OBVIOUSLY size which is no mean feat. The fact that her "career" was so short and there are few photos of her face raises her stock to number one for me
2. Merilyn Sakova
Technically, she's still modelling I hear, but as some abomination of cosmetic butchery. However, I'm only referring to her before her first retirement when she had among the best big breasts in the business. Hall of fame nominees before any conversation about them can begin.
Unfortunately, she committed the cardinal sin of cutting herself up after succumbing to mainstream propaganda in the erroneous belief that she didn't look incredible - so I can never put her in the number one position. There's a whole number of other positions I would have put her in back in the day tho.
3. Yulia Nova
If you're into stick thin girls she's a great example of what passes for attention arrestingly busty in that niche. For a skinny chick to get me aroused, she'd have to rival this. Although even at the time that I saw her tho, I was beginning to err more towards conspicuously outsized boobs. So she's in at 3 by default, because she's the smallest of the three and as far as I'm concerned size matters before you can worry about aesthetics.