A YL with a 100W rig and a properly installed 10M vertical should have no trouble making contacts on SSB when the band is open.
These days 10M is open quite often. YLs attract attention on the phone bands.
It should be a popular all band 100W rig, as single band rigs are generally worse in quality.
Nor is a good idea to buy a lower power rig as 100W rigs generally provide the best bang for the buck.
All band verticals are best avoided by Techs installing their first antenna.
But, if you must have something more than a 10M only vertical, I'd suggest a trap 10/15/20 vertical as being a good compromise.
You could install it without the traps. Put it on ten feet of mast and guy it with elevated radials.
You can install it with traps and just stop the adjustment procedure after the 10M part is done.
Then continue after you upgrade and need the other bands.