Anavar just kicks ass, plain and simple. I've run Anavar more times than I could shake a stick at, and it's a fantastic oral compound with minimal side effects. The only side effect I ever got from Anavar was a slightly upset stomach and it occasionally killed my appetite a bit. But this was on higher dosages in the 80-100mg/day range. Anavar is just about the only oral other than Proviron that I'd recommend using for longer durations than 4-6 weeks. A very safe dosage of Anavar for men would be right at 30-50mg/day if using for longer periods of time.
I would throw Anavar into any one of those cycles I've listed above at 30mg-50mg per day for up to 12 weeks, no questions asked. Anavar can be pricey, but it's a great addition to any cycle!! I don't think I'd go as long as 20 weeks with it, but I would have no issues going 12 weeks with it. It shouldn't throw liver values off too much at 30-50mg/day. You may notice slight elevations, but it's nothing that you can't improve once you come off and give it a month. You could even run only Anavar alongside your test replacement dosage and get some fantastic results.