My side by side comparison between the 200HT and the Dri-Eaz 2000 is different. Every single time side by side the 2000 pulled more water then the 200HT. Not that I am happy about that since I own the 200HT's. Also it's not what the specs would lead you to believe.
I don't think the 340 is a high heat machine, so between the two I would bet the Dri-Eaz 2800i would be the winner. I've not seen the 340, but I'd love to try one out.
Greg Cole said on ICS that he is going to do a bucket test between the 200HT, 340, and the 2800i within the next 48 hours. I am curious to see the results.
Since the Dri-Eaz 2000 outperforms the 200HT I am sure the 2800i will by far.