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I bought my Dymo Labelwriter 450 Turbo only a few weeks ago in August for my eBay business I am running, I was before purchasing this printing on an ordinary jet ink printer (which are incredibly expensive to run!) I would be using lots of paper too and would get through ink cartridges like there is no tomorrow.
So after researching online at the plethora of thermal printers there is to buy I managed to whittle it down tho a Dymo 450 turbo. It seemed a fair price in comparison to the other range of thermal printer on the market, also it fitted my needs with printing speed and the label width and height as I am only printing onto envelopes.
For someone printing onto envelopes too I feel this will suit you well as the models above do not do much different except print faster and wider labels but cost double the price.
One downside that I found after buying this product was that it is a hassle to setup and get the labels formatted correctly. It was frustrating finding this out after buying but i managed to get it sorted and now it works very well.
I have pasted the link to the PDF file of the Dymo 450 Series so you can read in depth.
I hoped this review help a little.