Wow thats a bit too detailed Paulbot!

For me - since 1984 to 2005 is pretty much get whatever I like within my meager budget = 125 TFs from all lines ( G1 to Energon) preeetty meager coz of the budget , had I more money to burn it would have been more as I really wanted to complete the Takara Booktype ones but decided Ill just get some of the G1s ( this was my mindset before then)
2006 - 2008 - I would say a kerplosion of G1s, and pretty much the current lines- Energon - Cybertron, Classics a few BW, BM stuff too. I was trying to complete most of the G1s before I bought a house coz I know there would be a sharp decline due to mortgage payments, so from 125 figures my collection increased to 500-600+ figures IIRC. My mindset for G1 this time round was - I HAVE to complete it 
2009 - 2010 - Finally completed G1 ( US released) also just buying out movie stuff ( not all), Generations and trying to complete Animated and focus selective completion of BW characters.... but my collection now as per figure count... is well past 1200+ Also just filling in gaps in G1 ( Euro stuff- AM), G2 and some Alts.
Wanted AM partner Vanguard, Myclones Dirge, G1 Victory Leo, e-hobby Dark scream ( the black version), e-hobby Magnificus
Parts- AM partner Basher-side guns, G1 Actionmaster Elite Windmill's blades[I][B]