I've gone for 2000s.
There was a good few years spanning the turn of the century where a lot of my (serious obsessive long-term lust object) favourite legends from the 90s were still performing, but there were also many of the hot young talents coming through that were going to take their place. While I was tempted to be nostalgic and just say 90s because that's when most of my all-time favourites were at their peak, in reality about 2000-2005 was a golden age for me in terms of how many performers were around that I could really lose myself in watching.
All of these girls which I had serious things for at different points were active during at least some of that timeframe :
Jenna Jameson, Jill Kelly, Tera Patrick, Briana Banks, Silvia Saint, Nikki Tyler, Anita Blonde, Chasey Lain, Belladonna, Eva Angelina, Lanny Barbie, Sky Lopez, Michelle Wild, Tyler Faith, Shyla Stylez, Jenna Haze, Aurora Snow..... and by the end of the same decade, other girls came along who would dominate my viewing. Sasha Grey, Tori Black, Aletta Ocean, Kagney Linn Karter, Alexis Texas, Rachel Starr.