Something like an EK-D5 Vario X-Res will suit your needs. The one i've linked comes with a reservoir attached as I wasn't able to find it on its own, however, it is designed for 60mm tube diameters so it fits perfectly.
http://www.ekwb.com/shop/pumps-and-accessories/pumps/ek-d5-series-pump/ek-d5-vario-x-res-100-incl-pump.html
You can look in the exact parts included with this on the side to see what exact things you need, as you have a res already