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If you use a dslr camera for the main image capture camera you can keep the cost down. You can pick up reasonably priced guidscopes like the ZWO 60mm one fairly cheaply and it comes with a focuser which the lower end Orion 50mm doesn't. You don't need a good laptop to run a guide app, a simple Netbook running Win 7 is fine and they don't suck a lot if power. My Netbook will run for three hours on its internal battery. At a darksite you will need a big battery with an inverter (not a big one as most netbooks can get along on a 200W inverter). Do you image stacking and processing on you main laptop in the daytime or back in the house. If you use a dslr with a liveview screen then you don't need to interface the image camera to a computer - just upload to your laptop later.
It's a fairly steep learning curve and you will get frustrated along the way, but it can be rewarding when you get it all working nicely.
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