Obvious front end options are the PS22 or the new DFA75. The former is tubed, the latter digital. I've seen good results from the PS22, (no view on the DFA, but reviews have been mixed) but I have gone for a PVS14 monocular on the eyepiece, which will make better use of the excellent glass you have. There are a couple of compromises on eye relief, but overall, it is a fantastic system. I have heard good reviews with the scope you specify. What calibre are you planning on using it on? All have limitations (albeit small) around recoil which should be considered, especially with no guarantees on the kit - although there are some capable repairers coming on stream. I'd recommend the 14, especially as it seems a little more available these days. You're welcome to come try mine should you wish.