I still use Calk's old kitchen 4.2 as my base. Constantly updated to all the latest builds from da_g's thread at xda.
Heres the link for the thread.
http://forum.xda-developers.com/showthread.php?t=544445
I usually check the last 5-10 pages every couple of days to find out the latest sys files since da_g usually doesnt release a rollup for every build in the first post but there are several other users that upload the latest build within the thread regularly.
I personally use a 28011 Hybrid sys folder I downloaded from that thread. I wish I could remember who uploaded it or when exactly I downloaded it. Has threaded email and Office 2010 but I am able to use an HTC phone canvas unlike most of the newer builds only the microsoft phone canvases work properly.
Also have Sense 2.5.2012 from this thread.
http://forum.xda-developers.com/showthread.php?t=633795
Follow the instructions to place the folders in the proper place. Ive also made several others ext packages from cabs that modify Sense like BG4All, different icons, etc.
I can upload them if anybodys interested. Also some of the packages didnt work for me like the messaging, music, and photo tabs. All I did was use the packages from the Sense 2.5.1920 packages in this thread
http://forum.xda-developers.com/showthread.php?t=584978
Also from that thread download all the packages that arent included in the 2.5.2012 packages from post #4 and #5. Not sure why they werent included in the original packages but Sense didnt work fully without them on my phone.
Its actually pretty easy to cook roms once you have your kitchen set up properly.