Oh I very much agree with Deirdre. I'm a big fan Cath/Sara relationship and as Deirdre mentioned I also thing that Cath is the best person for Sara on who she can rely on.
It's also a shame that we have only our memories and fantasy. Btw, 2 days ago I watched the episode Bite Me again. OMG, what a great Cath/Sara moments. Especially one, when Sara explain something to Cath and Cath gives her a look, i mean THAT look ... god, haven't seen such an eye sex for a long time! Has anybody seen this ep recently or has anybody remember the scene?