I used to have a HA3500 but recently picked up an Ampeg pf350 as I wanted something a bit more compact. It doesn't have all the features of the Hartke but I'm surprised at how much I like it. I seem to be able to get the tone I want easily and so don't miss the added tone and eq control of the Hartke.
My suggestion would be to go and try as many as you can, you might be pleasantly surprised. I'd always got on well with the Hartke and had no complaints but the Ampeg just felt right, you may find the same with a streamliner our something completely different.