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1) I'd buy new. I go for used when a single tire goes out and I want something to -- get buy for 1/2 year untill I replace them all.
2) I'd put sidewall pressure at the bottom of the list. Difference between 44 and 51 probably not as important as Size and LRR.
3) At your normal highway cruze speed do you "feel" that the RPM's are too high. If so then investigate larger diameter. If not then the larger diameter lowering the RPM's but increasing aero resistance will probably be a wash.
4) Check your rim width and see if you can go with a 215 or 225 wide tire. If you can then do they make LRR in 215/70 or 225/70 that might work.
5) Go to some of the tire company sites to get the ratio of old/new size. So you'll know when your spedo says 55 you are really doing 57 or something similiar.
Just the method I would use if I were in your shoes. Only speaking from experience not any special knowledge.
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