Anavar is a good drug for strength not mass. A lot of the top powerlifters like deca cause it keeps thier joints lubed up...some of them stay on low doses all year long. Winstrol would work well, primo too. I dunno, do some searches and look at some drug profiles and you'll find out soon enough.
Have you met my 2 best friends Anavar and Finasol. 8 weeks and bench went up 60 pds. With no weight gain. Now some people will tell you to inject Fina, BUt after I did some research I found that Fina injections worked very well (of course) but also give mass and size increase which I didn't want. where as people you just did Finasol get more Str increases with little or no mass gains.
anavar and halotestin are perfect for you. proviron would help too as this is a pure androgen which will help your strenght gains while having little anabolic effect. (yes guys i know its main use is an anti-estrogen)
don't overlook winny either. it seems to be thought of as the precontest BB's drug. but as long as you are not on a calorie restricted diet, strengh gains are substantial with little gain in BW.