Nolva and clomid should be good enough for your cycle. If you get any side effect from the clomid (and you are aware of those right?), you might drop it down to 50mg. You can also keep the nolva at 20mg. SO to recap:

Week 1 100mg clomid 20mg Nolva
Week 2-4 50mg clomid 20mg Nolva