As Tom said, 1095 or its equivalent should be fine, I've used quite a lot of 1095 with no problems. It's not simply the alloy per se that matters, the level to which it's tempered to after hardening is the important factor. If 1095 is in the 48-50 HRC range, it will be pretty much bang-on the desired hardness for sawplate. I've used plate that was measured at 53 and it filed & set with no problems.
Cheers,
Cheers,