I use 3 Hitec HS-55s for the swash and an E-Flite S60 for the tail on my HB King V2.
The HS-55s cost about $14 ea. and the S60 is about $17 at the LHS. You can find them cheaper, I'm sure, online (eBay

).
Lots of people use the Hitec HS-50 for the tail and are happy with it. It does cost more: about $22.
The 2 rear servos on the swash need their mounting holes elongated inwards to get a proper fit. Otherwise the HS-55s are a direct drop in.
Good Luck and Happy Flying!
-Vince