Right now I am using SKSE 1.6.16 with http://www.nexusmods.com/skyrim/mods/50305/? (a d3dx9_42.dll replacement) and http://www.nexusmods.com/skyrim/mods/41592/? (a SKSE plugin). I am happy with the performance.
SKSE 1.7 says it includes memory enhancements made by someone else, but I don't know if it is one of the two enhancers I am using now.
What additional programs do you use with SKSE 1.7? I don't want to use ENB.
Thanks.