I like them. All have better letters than the 16,500 or so available to register names. Each should bring you low $xx at the very least.
IOUJ has good letters, three vowels and can be typed easily (all letters next to each other on keyboard). 561 Google. It could have made a good IOU typo, but the site isn't developed. I'll bet a fair few people still in type IOU though and you still might get some typo traffic. There are no remaining combos with three vowels and none with three premiums and a J (or any other lesser quality letter for that matter). I would value this particular name at $2x plus at the moment.
HIEJ has three premiums and a lesser. 21.5k Google. Minimum value $2x IMO.
OOGJ has three premiums and a lesser and a repeating O. 516 Google. This name should bring $2x to $3x without too much difficulty.
JEIW might just be a JEW typo, but the user would have to have two inch thick diagonally spliced fingers

544 Google.
YIUY is very user-friendly as all letters are next each other. I can't pronounce it but others may be able to. 828 Google.
I have not researched domain age, backlinks, PR etc. These factors may influence the value but I have appraised these domains on letter quality only. I don't have enough time for an in-depth appraisal of each.
This is my opinion only. I hope it helped. Values quoted are what I would expect these domains to make at NP auction.
Matt.