Hey Faisal,
I'm actually currently using a Dunlop DC Brick and a One spot to power my 11 pedals. I have 10 9V pedals and 1 18V pedal. The DC Brick has 7 9V outputs and 3 18V outputs, so I chain and one-spot my "back-tier" pedals that i dont use so much. I don't really have a problem with noise or anything, my pedals are pretty standard, some Boss, one Mesa, one Ibanez, one Korg tuner and a Catalinbread.
Whilst its true that isolated power supplies are supposed to eliminate noise via grounding, I think its overstated that "non-isolated" power supplies always produce noise. If you're using a one-spot to power 10 pedals, then maybe thats asking for it, but I've personally never had problems with my Dunlop DC Brick.
The price differential is also quite staggering. I managed to get my Dunlop DC brick second hand for 100. Whereas a Cioks DC10 or a similar Voodoo Labs would be at the very least 200 second hand, or 250-280 brand new.
Honestly, I think if you're using 6 9V and 2 18V, you're better off saving your money getting a DC Brick and using the extra money to jam more/upgrade other equipment like cables, etc.
Just my 2 cents man, but of course, its up to you.