No such rod as the Evo GT, unless I'm misreading your post.
Evo is a rod made with higher modulus carbon which Terry reckons make them 20% stiffer / more powerful. So: M4 < M4 Evo, HST < HST Evo, ZTI < ZTI Evo etc... GT just means Terry has added a blended glass tip rather than a full carbon rod; better bite detection and makes casting the heavier leads a bit easier. Hence M4 GT, Bullet GT, Zeteque TXL GT etc...
Like Nicky says you get what you pay for. I've used a few different rods, Daiwa, Century, Abu but I love my Zziplex's and wouldn't part with them. Primo Synchro is a fabulous clean to mixed ground rod, light, very responsive, excellent bite detection and great feel but will still put a lead well over 250 metres in the right hands. M4 Evo is pretty much a perfect allround rod for the NE coast; very slim, very light, a fair bit stiffer than the Synchro but still loads of feel and has been cast over 300 yards on the field.
Oh, and if you think Zziplex rods are expensive (hand built in the UK), try looking on the Moonfleet site at the price of some of these continental rods
