Madge and Helen Libby and Steph Susan and Lyn Harold and Lou Sonya and Mark Declan, Ringo, Zeke, Donna and Didge/Kate. Mike, Jane, Scott and Charlene Billy, Anne, Toadie, Lance and Amy Doug and Lou Mrs Mangel and Eileen Des and Paul Jim and Dorothy
Steph and Libby are such a good pair it just makes it even more heartbreaking they can't or won't get Kym Valentine back on the show - with Ben around too (and lets face it, he probably won't be for too much longer as most teens move on) now is the time.
I'd also go with Lou and Harold. Also Boyd and Stingray and Toadie and Lance (in addition to Toadie, Connor and Stu with the house of trouser)