If you were pleased with the Echo, buy another one. You can't get them new from dealers anymore, but you can on eBay. You just have to be patient. I picked up a brand new 3400 a couple months ago for $200 shipped. That way you'll have two identical saws and, in a pinch, you can scavenge for parts off the old one.
Otherwise, the new Dolmar top handle sounds like a good saw at a fair price. The new Echos just don't feel right in my hands (330, 360). If you're not set on a top-handle, you can still get the rear-handle Echo 346 at Home Depot ($280) or on eBay ($165, new in box).
As for a 28-30" saw, I think that your choices will be limited to stuff like Stihl's 460 and 660, Husqvarna's 372 and 385 (and 575, I guess), or Dolmar's 7900 or 9010. Echo and John Deere/Efco/whatever also make 80cc saws that are solid designs, though not quite in the same league in terms of power-to-weight.
I run a Dolmar 7900 and a Stihl 066 and both are capable of running a 28" bar with authority, though the Dolmar is happiest with a 7pin sprocket whereas the Stihl competently runs an 8pin. By way of comparison, the Stihl clearly benefits from its extra 13cc of displacement over the Dolmar when it comes to grunt, but the Dolmar also weighs three or four pounds less and costs $400 less than a Stihl MS660. Also, if you're going to be carrying the saws around a lot, it has been my experience that the Stihl has more or less neutral balance with a 28", whereas the Dolmar is decidedly bar-heavy with a 28" bar.
Dolmar 7900/28":
Stihl 066/28":