K1S has some unstable long term firmware/hardware quirks so be prepared. The mic/audio is usually useless too. Check the Amazon 1,2 star reviews. We decided not to stock K1S after failed testing. If you get one to work, you're one of the lucky ones. Glad to hear you're ready to upgrade in 2016 hopefully that holds you over for now.
I purchased from Amazon, using a credit card so I am protected against product failures. The 0805 has it's quirks mind (Notably mine decides to randomly turn off every now and then). I'm not fussed about audio, indeed my current cameras are both muted because realistically who wants to hear me sing or talk to myself?
😉 My car also has a "battery protection relay" which turns off about 20 mins after the car is locked, and turns back on once the car is unlocked, with no power cuts to permanent supplies on starting the engine so should alleviate the "starting" issue.
Ideally I would like a system with small cameras (similar to this)
2 ch front and back, or 4 ch (the other two cameras mounted in the rear small windows of my vehicle, pointing forwards to cover left and right at junctions). Discreet, high quality and easy to professionally fit (I'm not afraid to go and fiddle with the fuseboard or electrics of my vehicle!)
I did look at the idea of a NVR, with 4 discreet cameras connected with ethernet/PoE, and as the NVR included Wifi you got that feature for free! Unfortunately with no GPS, G sensor or ability to lock files, and only composite video quality, that was not a route I was going to take.