Probably Inu and Kagome being the most obvious, although I do like the relationship Sango and Miroku have~ probably because it's more of a 'will-they-won't-they?' than Inu and Kagome, which has its issues as a relationship through the series but is more obvious as an outcome that they will get together. I liked watching Sango and Miroku getting closer (as much as with Inu/Kago) but with the uncertainty making it a bit more interesting