He's gorgeous! If he were mine, I'd keep to see how he trains week 4 and 7. However, because he's out of an EWE and by a sire who isn't on any leaderboards, you're unlikely to see this guy hitting any boards in the future aside from the freshie boards. Of course, the random factor has a mind of its own so it's still possible he could hit the ISHLB, which is where we look at training for clues. (All up week 4 and at least 2 up week 7 indicate a possible LB horse, though not guaranteed.)

ISH is less popular overall as a breed, so while his color is nice, he's worth a bit less than, say, a SH of his same color. 1 year old colts of any breed are currently listed for a minimum 650k, but there's also a shiny 5 yo SH of his same rating and color (minus the dun) for 250k. So, untrained, you'd likely price him somewhere in there. You can always start higher and lower the price if he doesn't sell after x days/weeks. Or keep at least 4 weeks to see how training goes.