I'm definitely not part of the 'you get what you pay for' camp, as there are plenty of companies in airsoft trading on past glories. But I bought a PDI barrel for my Vz61 Scorpion and the range increase was impressive, so I bought another for my SVD and the range on that is spectacular. So basically PDI are not all hype. Whether their stuff is worth the money is only something you can decide, but as a comparison my SVD gained around 10m of effective range compared to a Madbull Ultimate TBB. So I would say if you can afford PDI, get PDI.
For an AEG their 6.05mm barrels are probably best, so you will need to change springs to maintain your FPS.
I've also had good results from chromed brass barrels - Guarder 6.02mm and Falcon 6.03mm. I'm not sure whether to recommend the Falcon Dual Point hop rubber which can come supplied with their barrels because, although they do improve accuracy, they struggle to lift 0.25g BB's a little, so I've found i get greater range from 0.2g BB's but, of course, this makes accuracy at extreme range much more subject to wind conditions. However with my AK-74 I can reliably hit crouching man sized targets at 55m so long as the wind isn't gusty, although that has a 455mm long barrel.
If you read this thread I go into some of the issues surrounding barrels.