Isolator Help

[SinCitySound]

I am in the process of setting up a system in my '01 4.7L V8 Durango. The system is going to include:

Kenwood KVT-514 HU w KNA-G510 GPS unit

Rockford T1000-1bd for the subs

Rockford T-400-4 for the mids & highs

3 12" Alpine Type R subs in a ported box

4 6.5" P1S652 speakers for the doors

I am considering installing a 2nd battery and isolating it so that I can run the system when the truck is off w out worrying about killing the starting battery and also so that I don't have to worry about the batteries killing each other. I have the stock alternator in the vehicle which I think runs at 136 AMPs.

My questions are:

1) Is a 140 AMP isolator good enough? Should I go with something larger like a 200 AMP one?

2) What's the difference between say a Stinger 200 Amp Battery Relay Isolator SR200 SGP32 (eBay) and a NOCO IGD-200HP (eBay)?

3) Which type of isolator would be best for what I am looking to do?

Thanks in advance!

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[Mr. Slate 10+ year member]

Stinger is sufficient.