I currently have all the 2 CD Castle sets from 1995. Since they're going for decent bucks on Ebay, I'm considering selling them to help pay for the upcoming big box set (see other thread). I'll need to replace them, so which ones to get? How many different versions of Maiden albums have come out on CD since 1995? Which are the best? Which are still available? Do any have nice silk screen artwork on the discs like the Castle ones do? Any info, pics, anything anyone can provide me would be greatly appreciated.

I had traded in all my Maiden CDs to get the double Castle ones back when they came out.

The current Sony ones have enhanced disks with music videos. Also, all the CD spines form a picture of Eddie. So you need the whole set for it to look right on your shelf. I'm staying with my Castle Records ones. The only one I had thought of replacing is Live After Death because it finally includes side 4 of the double-vinal on CD. But then the spines would not match.

Do the Sony ones have nice silk screen designs on the discs themselves? Do you know which ones do? I really like that as a feature.

I don't know. I haven't bought any (see above). All I know of them I saw from just looking at them in the store.

at least Live After Death and Fear of the Dark (the only two I have the Sony versions of) are picture discs, so I'd assume the others are as well.

Are they the same pictures on the disks as the Castle Records ones? My Castle ones of those 2 have the pictures of Eddie on the mountain by the organ (on L.A.D.) and Eddie holding some guy by the head in front of a newspaper-looking background (on F.O.T.D).

No, they're different. The Eddie on the mountain by the organ sounds like the original Phantom of the Opera poster. I don't recognize the other.
The LAD cd's are: Disc One: Eddie standing in front of the grave stone featured on the album cover. Disc Two: The cover art from the back of the 4 LP vinyl sleeve.

FOTD: a blow up of the cover art. Nothing too spectacular.

To be picky, these are on Raw Power records (which may be a subset of Sony). Regardless, they sound great, and the enhanced CD features are cool.