I researched mid-priced condos in Naiharn, Kata and Karon last year:
You can also check 'ReLife' condo, very near that one you asked about (Naiharn Beach Condo - NBC), but much better location right on the main road leading to Naiharn beach (I heard that NBC has some problem with main road access, or even doesn't have any, this is what few agents told me last year).
More near to the beach is The Lago condo, it was a bit pricier than ReLife, but the pool had very bad green color (this was last year).
Nearby were Calypso and Utopia condos, I didn't check those, which probably means they were expensive lol.
Nearest (and in my opinion, the best) apartments near Naiharn beach was The Sands condo, it's just next to the beach, tropical style and quiet, but I didn't see any rental ads for it, only sales... I think it must be quite expensive, if can rent at all.
Cheers,
Alex