Wire For Trellis

Hi All.
I need to put up some wires for 2 new climbing plants that as yet not purchased. On my old shed I have used the green coated wire which to be fair lasts for 2-3 years before needing replacing. The only problem with shed is since the frame of shed is very narrow I could not use the proper eyed screws and had to put in nails to attach the wire.
Trouble is I can never get a good tension on the wire and never looks neat. The 2 new plants will be on garage wall and fence so I can screw the eyed screws into fence posts and cement joints so I can really pull and get so tension.
I have looked at the Gripple system but just for the garage I would need at least 22 gripple tensioners which if I buy them on ebay will cost £30.80 not including the nylon wire. Not so many for fence but nearing £50 just for the tensioners.I am now thinking that is a bit expensive so may go back to normal wire and just twist ends to tension.
Is the green nylon coated wire the way to go or a more durable thicker galvanised wire better and has anybody got a method for tensioning the wire or is it a matter of just pulling tight and twisting end? I have been trying to find something that once I have the wire tensioned I can crimp something on the wire like you do in commercial fencing, trouble is the tension tool is around £90!!!

 

I've used the plastic coated wire, square mesh, stuff you buy on a roll and have used small garden staples to secure it to wooden fence panels, it's worked fine and i let clematis cling to it - which they do beautifully !