rb20det battery help

[jonathan240]

I have a s13 240sx with rb20det swap intercooler piping goes by battery tray, and have a walmart lawn mower battery, but dies everytime. I dont have much of electronics all i have is

8" dual subs(i dont like to turn it loud as ****, just cruzin smooth style)
greddy boost controller 2
autometer boost guage
autometer temperature guage
autometer oil temp guage
radio(would like to listen too while driving)
heater (no a/c)
and thats about it, may be adding more things in da future

Any recommendations on a small battery i can use (or should i just relacate to trunk?
also i live in usa colorado and it gets cold (really cold) negatives temperatures i need a battery that wont let me down

i was thinking of
kinetic hc600 battery
braille battery (which is the right one)
oddyssey
miata Westco battery

thanks guys
also how many cca do i need to start on a normal winter day (sorry to ask)

[TheyKilledKenny]

Do you have enough room for a regular sized battery? Lots of guys like the dry cell's because they are lighter, I use a regular wetty. You want a battery with some decent cold cranking amps for those cold days, 600 should suffice. The first thing I did when I got my car was rip out the tiny crappy Japanese battery for something with more juice.

[Tony-R32]

Relocate to trunk ftw!

[m_melen]

miata batteries don't put out much unforunately. they are perfectly sized though, maybe if you can find an upgrade battery for a miata