Time for a new battery :(

[masterbusa2]

Okay so my 97 mustang's battery is from /04 and yeah its getting pretty old already had to pour water in it to make some more acid, when i turn on the ac or anything liek that the lights dim like crazy I have a 2000watt Quantum audio amp and a Power Acoustik 15" fubar, I have already done the big three upgrade and now the bass doesnt make it dim too bad, but everything else still does xD so I went to the local parts store and was wondering if a duralast gold battery with 760 Ca's and 650 Cca's would do the trick? Or is there a bettery battery for around the same price around the 100-140 range that anyone can think of off the top of their head that will fit in my mustang? any tips are greatly appreciated!!

Edit: btw the battery i have on my car atm is only 350 cca's xD its an old walmart battery

[MIKE-2U]

slightly used xs power or kenitik or c and d or stinger.