Oh dear. I see the NE fetish for super stiff rods is alive and kicking on this thread. I mean seriously - Dymic LT Bullet, HST Evo and really taking the biscuit the M427SU all rounders? Really?
All these rods are at the stiff end of the Zziplex range and would never in a million years be classed as an all rounder. M427 hiflex is pushing it and, funnily enough, the modern version of the Primo Synchro is probably a little bit soft in the mid-section for what the OP wants (though I love mine and use it on Seaham north no worries).
True all rounders in the Zziplex range that will do a job everywhere except kelp hauling (IMHO): I'd start with the bog standard HST, big brother to the Primo Synchro and a joy to fish and cast with (I've watched Gary Dickerson hit well over 280 yards with the HST on the field). If you want something a bit stiffer then look at the M4 Evo, another 300 yard rod but with a bit of feel and again a joy to cast (though mine only comes out for heavier ground, I use the Synchro and M4 GT for most of my fishing). Personally I love my Primo Synchro, a proper wind-up rod that will put a lead miles but has loads of feel and is, first and foremost, a fishing rod. However as noted it may be a bit soft in the mid-section if you are used to super stiff rods. M4 GT is another good option - basically an M4 Evo with a glass tip and again a rod that is a joy to cast and fish with but the tip can tend to fold if fishing in very strong tides.
I've fished with the Dymic LT Bullet and while I liked it it is in no way an allrouder - it is a 175g plus bait rod that needs a good technique to cast well and is pretty much on the stiff side. I've cast the HST Evo and again whilst it is a slight step down from the LT Bullet I'd never class it as an allrounder.
Mind you when looking at Zziplex the best advice is always (if possible) try before you buy; they tend to be very individual rods. That said they hold their 2nd hand value so if you don't like one you will normally get back what you paid if you bought it 2nd hand.