I had a similar experience, I missed out of God of War on PS2 and later bought God of War Collection on PS3 and when I saw GoW2's ending I thought to myself "Man I would have been pissed if I had to wait 4-5 years to see what happens".
OT: Little.Big.Planet. I got caught up in the hype surrouding this game and I was thinking of buying it Day One but luckily I got myself a beta code and dodged the bullet.
I could say the same thing about Metroid Trilogy. I have the first GC Metroid, but I missed the other two. So I was happy that the trilogy came out for cheap! Now really cheap if you can still find it!