Miles

This is not a pro system, just a very basic home system. Looking to pay around £40 (in the UK) for the camera. The one I want to replace is mounted high on the house, I'm looking for a overall view rather than face recognition. I would like better IR performance then the current one:

Currently have 4 CMOS cameras that look similar to this: Image quality/resolution is not very good, colours in day mode are not accurate, and night range is poor, but they were extremely cheap and are mostly adequate for my home system. However, I would like to replace one camera in a strategic location with something a little better, but still cheap. There are several CCD "bullet" (?) cameras on ebay that look like this or similar: My questions are: 1. Would this be an upgrade or do these cameras still suffer from the same problems as the cheap CMOS ones? 2. Where could I find a guide to explain in noob terms what the specs mean (I think I know what TVL means, but what about 1/3" Sony Super HAD II CCD, 1/4" SONY Colour CCD, IR 30pcs/850nm distance 25m, Lens mm and degrees filed of view and so on...)

I'm proposing to replace an old Windows 98 PC with a new dedicated DVR. I'm considering the two products listed in the title, but have questions about the specifications and was wondering if anyone could help. I'm most confused about the recording resolutions and framerates. The specs for each give the following at roughly equivalent resolutions: TA-462: KPD674: Is the 50 fps per channel, or in total? I.e. if I have 4 cameras going at the same time, do they record 50fps or 12fps?