Someone with a small budget will have to go with a cheap package. Samsung has some good analog kits for the money. $1000 for a DVR and 8 cameras. That's like getting the DVR for free. But it won't even compare to a 1.3MP network setup in picture quality.
Analog Pros: Price and the camera wires can be ran much longer(up to 4000ft with Balan) than the 330ft(longer with PoE extenders) network limit. No network knowledge needed.
Network Pros: Image quality and system control.
I just quoted a 16 network camera system to a hospital. This is my cost on the system:
16 channel NVR 2MP/CH 4TB Storage = $1,900
1.3MP WDR Dome Camera = 13 x $400 = $5,200
2MP WDR Dome Camera = 3 x $700 = $2,100
Cisco PoE Switch = 2 x $500 = $1000
Surge/UPS = $300
Plenum CAT5e = 6 x $200 = $1,200
Labor = 160hrs x $50 = $8000
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Total Cost = $19,700
25% markup makes the sell price = $24,625
So $15,000 is very normal for a good network CCTV system.