Forgot to vote.
I'm wondering if I'll have time/BTC to buy more 100TH-mine shares before they skyrocket like ASICMINER did...

I guess you know how I voted...
How could it skyrocket if the price is already 0.5 BTC/GH, which is higher than current Bitfury price of 0.16 BTC/GH? Unlike ASICMINER, 100TH is just 0.2 GH per share without any future reinvestment/upgrade plans so far. Right?
100TH-mine: last price 0.139BTC/share, 518271 total shares, 104TH/s projected hashrate : 1,44GH/s per BTC
ASICMINER: last price 1.62BTC/share, 400000 total shares, 262TH/s projected hashrate : 0,4GH/s per BTC
Can't guess where you got your numbers from.