Specialty batteries, optima’s, etc

Hello, i have a question about deep cycle batteries. i think that is what they are.  the Optima red top / yellow top, Exide Orbital 34XCD, Motomaster Eliminator with spiral grid, etc.  I have had a few systems in my cars over the years, but havent had much experience in batteries, alternators, etc. because i never really had systems big enough to cause me voltage problems.  I see alot of guys use these batteries as secondary batteries in the trunk for amplifiers, my main question is.. can you use these batteries to replace the regular battery under the hood? like as a starting battery AND to run the audio system??  my system isnt huge, i am running a Kenwood eXcelon X810D  currently putting out 400W RMS at 4ohms (about half its power) to a pair of Kaption COMP-108 (Canadian brand) subs. I see some batteries here in a Canadian Tire catalogue that range from 690cca to 770cca,  so yea, i am just wondering if i can replace my regular battery with one of these specialty batteries, and if i would gain anything by this. Its not alot of wattage by any means, but the dash lights and headlights still dim in my '94 cavalier even with the capacitor. down the road i may consider a high performance alternator and bigger wires.

Anyways, thanks for reading.. I appreciate anyone bringing me up to speed on the batteries:)

Kinetic batteries....................................they R like a power cell.....

Google , em........

yeah

i got the voltage checked on the alt,  it wasnt putting out what it should. so i picked up a rebuilt one from a salvage shop with a 6 month warranty lol..  u think i should get a high preformance alternator and new wires before considering an Optima Yellow Top?  cuz i figured the Yellow Top holds the charge better, and therefore would be easier on the alternator? yeaa all this stuff is so confusing, at least if i bought a yellow top i could hold onto it when i sold the car and put a cheap one in so i could use the yellow top in another rig.  but if i put a $400.00 H.O. alt in a 11 yr old car and the car dies on me in 6 mos im s*** outta luck right.  i dunno kind of an "i dont know what i should do for the long run" situation.

Thanks