It depends on what type or corals you plan on keeping. You will need lots of circulation for a crest reef with sps corals, less flow for LPS or soft/leather corals. The Koralina line is an less expensive line, nice flow, the maxi jets are super reliable but flow is lower than the others.
personally as much as i want a vortech only thing i dont like with them is you cant aim them like the tunze's downfall to tunze got to get a controller, but when you weigh them out 2 vortechs are going to cost more then 2 tunze's and a controller, is you have a aqua controller they do have the add on to control the tunze's