3 products that I have used and would recommend are: Affirm 5n1, Aubrey's GPB, or the Ion Reconstructor.
None of them are heavy-duty like Aphogee or Nexxus Emergencee but they are all good weekly or biweekly use products. I've never experienced any dryness or brittleness from any of them. I do always follow up with a moisturizing conditioner afterwards. The Affirm 5n1 is probably the hardest to find as well as the most expensive since it is a salon product. You can order it online from
www.sheldeez.com, metrobeauty (I think), and some Asian BS might have it. Make sure you compare prices before buying though. Check health food stores like Whole foods for Aubrey's. The Ion reconstructor is the cheapest and can be found at any Sally's BS. They sell sample packets, so you can try it for around $2 first.
Recently someone on the board recommended the reconstructor by Design Essentials. I haven't tried it yet, but you might want to do a search on that one as well. Supergirl and a couple of other members also gave good reviews to the Deep Brilliance Reconstructor.
HTH