What motherboards are based on Intel 915 and Intel 945 chipsets

Which current motherboards are based on Intel 915 and Intel 945
chipsets?

I am not that familiar with Intel series boards - what do these ones
have over the the more recent 8xx series chipsets?

The board must have at least 5 PCI slots as I will be needing 4 of them
straight away for building a DVR system using bt878 based adapters.

The 915 and 945 are the boards recommended by the vendor of the
adapters, however I am looking for something moderately priced and I
am hoping that boards of this type are not too expensive.

I'd also like to know what type of CPU chips go with them. There seem
to be so many Intel CPU types and I find it all rather confusing.

Are there any stock Dell machines with enough slots which will fit the
bill? Even if they are server oriented that will be fine.

/