10mm ...
... choices, choices.
2 kinds of Glocks;
6 kinds of still-available Smiths (for the 10XX-series ignorant, that's the 1006/1026, 1066/1076, & 1046/1086);
and, as the posters who've sighted them indicate,
lots of pre-owned DEs in various conditions.
If you see a decently-priced S&W 610, new or used, this presents you with still another 10mm option - and in barrel lengths ranging from 3"-6". I mean, how many people on your block own a
revolver chambered in 10mm? (Quick as hell to reload w/ full-moon clips).
Yeah, you've also got 2 options in 10mm with the Witnesses, but after reading the posts on their poor quality-control (and not only in the 10mm versions), as well as EAA's sucky customer service, I'd pass for now (my opinion - others will differ, but you might do a Search on it).
Check my Sig for the choices I've made. They're both great pistols - completely different - but still very satisfying to own, carry and shoot.