Those Boston speakers are nice, but so are the Mags.
I honestly don't think you will need 4 of them to do impressive numbers. I am sure 2 of them could come close if not over 140 with the right install and sound dam good to boot. Also they are very efficent and don't take the whole 1000rms to get them moving like others have said........which means you can keep the gains lower and not stress your electrical as much.
Also for a cheap way to help out your electrical system, do the big 3. Probably could get away with 10' of some 0/1g wire and go to town, which isn't all that hard to do. Mine is, because my alty is under the car, but if you have a truck, then should be eaiser. There is a thread on here to help you out as well.
Good luck.