i need ideas for some tools

simple answer and explanation behind it please

https://www.amazon.com/gp/product/B0000302X1/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

is this good for cutting 0 gauge? like butter easy?

https://www.amazon.com/gp/product/B00HJYVFSG/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A2TLTYG8U2QKGY

https://www.amazon.com/gp/product/B00E1UUVT0/ref=ox_sc_act_title_4?ie=UTF8&psc=1&smid=A2TLTYG8U2QKGY

using this to crimp 0 gauge is this good enough? or any other tools better? im not crimping o gauge everyday or crimping every time i dont work for a shop just maybe once in awhile thing.

are rotozips good enough to cut wholes for subwoofer 12" holes?

i dont wanna buy a router seeing that its 200 starting

https://www.amazon.com/RotoZip-Tools-SS560vsc-31-120-volt-Spiral/dp/B00TODY8BQ/ref=sr_1_1?ie=UTF8&qid=1486004406&sr=8-1&keywords=rotozip

https://www.amazon.com/RotoZip-CRCT4-Circle-Cutter-Guide/dp/B003BIFMJ2/ref=pd_sim_469_3?_encoding=UTF8&psc=1&refRID=57112NH9ARXP3FFQ7NW0

and be using this circle cutter guide

are these tools any good or anyone can link me some useful tools they use on the daily or experienced with the tools i linked on a good or bad 1 out of 10 rating would be helpful.