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Personally I think if your worried about lack of quality at a3 or larger, then getting a test print is probably a good idea.
10mpx is a low number on todays cameras but its not about how many pixels you can cram onto a sensor. Granted the fewer you have the smaller your largest print can be.
I sold a canvas that was just over a3 that was shot with D60 (same sensor I believe as D40X) and that seemed ok, though I wouldn't want to bump up to a2 if I knew someone was going to go up close and inspect it.
Software can help with enlarging but if you don't have it already it could cost more than a higher resolution body.
How many larger prints are you likely to get in future. If lots is the answer maybe a permanent solution is needed
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