That sounds good. You can use everything except the NET and for now the RKE head unit with the Archon if you ever decide to upgrade.
Right now I have this connected
1 Archon head unit and power pack
5 PC4's
1 SLX
1 SL2V2
1 SL2
1 HUB
3 DP1's
1 MLC
I also have these that are not hooked up at the moment, but have been
1 PC4
1 PC1
1 ALC
1 SL1
I unhooked them when I was doing something and never got around to joking them back to the system.
I have the RKE, NET and RD1 that cannot be used with the Archon at this time so they are not hooked up.
I am not sure whether the SLX or DP1 module will work on firmware 2.06 since that are newer modules. So check with DA before you get one of those. I know they work on firmware 3.02 on the RKE V2.