If you do go with Threads, avoid the 6.4.1 release which is the current one. There are known bugs with search and stickies and some (our site included) are experiencing significant slowness vs 6.3.2. I really wish we hadn't upgraded, it's been a step backward in some regards.
I'd either wait for 6.5 and hope these kinks have been worked out, or use 6.3.2 or 6.4 (if Infopop would give them to you).
