You might ask your doctor about Rituxan+bendamustine. Bendamustine is even milder than Rituxan but the combination is more effective and has fewer side effects than R-CHOP.
My experience with bendamustine was very positive. Rituxan nearly killed me (anaphylactic shock will do that) but the bendamustine caused no problems. My IGM went way down and has stayed there for more than a year.