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I have a bit of experience here, 4 cameras are rarely enough, I would suggest at least 8, though you still can get multiple 4 channel systems and use them in different regions.
1TB hard drives are pretty much the standard for the low cost systems, but most are upgrade-able after purchase.
PoE is nice but tends to be more expensive, the system I have at home is a 720P that uses RG174 coax. It operates at a reduced frame rate, but you don't need high speed for a security system.
Solid state drives of that size are much more expensive.
Placement of the cameras is important, you want to place them where it will be difficult for someone to approach the camera to disable it without being seen by at least another camera.
Keep in mind, even if they say the file format is MP4, it is likely to be a proprietary format so viewing off of the system can be difficult.
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