Here's my setup just to give you an idea:
1-set Infinity 6020 cs consists of: 2 midbass, 2 tweeters
1-set Rainbow SLC 265 consists of 2 midbass 2 tweeters
2 V12 amps
1 Hifonics Brutus amps (for subs)
2 10" Hifonics brutus subs
H/U: Pioneer 4050UB (2-way active)
Note: my H/U is 2-way active only so even though I have all my speakers wired directly to my V12's, my tweets have a capacitors in them, that I placed in it's wiring, I forgot the value, this is to block out any low frequency from going in and blowing your tweets, the mid bass though are pretty much straight-forward, I made sure though that my V12's HPF are set to ON, then adjusted my HU's HPF to 125HZ since it has its own sub control (I'm saving up for a either a Alpine CDA 9887 or Pioneer P80PRS, these are expensive full-active HU's with Time Alignment as well

)
In respect to previous posts, yes Passive and Active has it's own pros and cons, it's just a matter of taste, bugdet, and free-time for tweaking it, actually if we have a scale of 1 to 10, 10 being the best sounding, it is going to be harder to get to 10 with passive, yet much rewarding as it's more than just a install then sit-back-and-relax system as most manufacturers claim them to be, remember impedance/resistance rise as more heat is genarated? it changes the values or cut-off points of the passive's internal resistors/capacitors.
with going full active, the best way really (which I over-looked initially) is to get a full-active HU, it will save you in the long run than getting an outboard electronic crossover, since 8" sub is what your planning to use, you can get 1 4-ch amp and 1 5-ch amp connect your front stage to the 4-ch, connect your A-pillar, rear and subs to the 5 channel, Firland is a good brand, not that known but I've heard and seen them, seems OK for me, if you're already stuck with the HU that you have, then some electronic X-over you can look at are:
http://www.sonicelectronix.com/item_...ar+VIBEX6.html
http://www.sonicelectronix.com/item_...ar+VIBEX8.html
http://www.sonicelectronix.com/item_526_Kicker+KX3.html
and of course
http://www.sonicelectronix.com/item_...N+MODEL+-.html
for seps you can simply get 2 sets of 2-way comps and subs
DLS is a good brand, you can also get HERTZ, Rainbow, MB Quart, Morel, Focal, kung medyo budget you can try Ryan Audio, they have something that are like Focal, which also are made out of POLYGLASS, for subs if 8" na talaga then ID or these can do:
http://www.mickeysautosound.com/8-in...subwoofer.html
http://www.mickeysautosound.com/8-in...subwoofer.html
also I noticed that at Mickey's, all MB Quarts are 50% off, so you might want to take advantage of it to.
Coming from a car guy that has experience with both active and passives, I love tinkering stuff so I love my active setup.
