Any website that allows me to enter the amount of my multiple altcoins and shows me the total dollar amount and tracks the value of the portfolio?
I use Blockfolio an app that does exactly what you described.
http://www.blockfolio.comNot sure if they support all altcoins but they support several. Never tried adding altcoins that were not already there so maybe there is a way to customize. It is worth checking out.
Edit: I just saw they have over 800 currencies so you should be all set.