I think you have this a little backwards.
First, no premium and SE are not the same thing (on any asus board, not just the 775's)
Second, SE is not a stripped down version. In fact in some cases it's just the opposite. ex: k8v (stripped) and k8vse (loaded) Even then it's not that simple, it's not like they are the same mobo with and then w/o some extras included with the mobo. It's is acctually a difference in the mobo (gbit lan, more firwire, something) This can be confusing when a board has 3 versions though. The best way to find which board is the loaded one, look at that table you mentioned above. Find the socket you want (i know you knew that) then the chipset you want, now all the boards with that chipset are listed on that line. The "fully loaded" on is on the left, the "stripped" on the right, and the "midrange" in between. Of coarse some chipsets only have one or two versions, but the same logic applies. note: you'll find one weird listing. the Intel 915P chipset. It's not as confusing as it looks. It's just listed funny cause the P5GD1 and the P5GDC Deluxe don't support DDR2. I personally think they both should have been listed below the others, but nobody asked me

So the best 915P that supports DDR2 is the P5GD2 Premium, next the P5GD2 Deluxe, then the P5GD2. The best 915P that supports DDR1 is the P5GDC Deluxe then the P5GD1. Hope all that makes sense!
About the DDR1 support, it has to specificlly say whether it does or not (only 1 board. the P5GDC-V Deluxe supports both [i think])