Personally, I don't think with a mostly PDF library you will be satisfied with anything that has a display under 8", and unless you plan to only view files converted from PDFs (not likely to be stellar by any measure) chances are integrated dictionary use is out.
If I were in your shoes, I'd forget about any integrated dictionary support (and instead purchase a high quality dictionary eBook for my device to consult more traditionally) and save up for an iRex Digital Reader (10" display).
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