ORIGINAL: DANTHEHUNTER
With all the after market products out there if I was you I would find what I like and if you need a thumbhole stock buy one. As far as the howa goes it is a good rifle I have a 6.5X284 that I had made for me using that action. But for a varmit rifle I like the ruger MKII target models. I have that in a .220 swift and have had in a .22-250 after some playing with reloads it shoots great.
HOWA, IMHO, is one of the best actions on the market, I have had several HOWA 1500's and they were all damn good rifles.