For what it's worth, I can tell you all that I am intending to check the ranges
451, 453, 455; and 469, 471, 473, 475, 477, 479, 481, 483, 485, 487, &489 from 190000 to 230000 in the near future. So if anyone has already checked any of them, I'd appreciate a heads up.
Dale Andrews maintains a list of Riesel ranges with k values from 300 to 1000 at
http://www.geocities.com/primes_r_us/riesel/index.html
I keep a list of Riesel ranges that I have checked at
http://www.geocities.com/harvey563/reisels.txt
Harvey563