Strong drink recommendations

Question for my fellow sophisticated drinkers. I’m looking for a strong yet smooth alcoholic beverage. However, I’m still searching to have a go-to drink like Don Draper in Mad Men, at the end of a long week. Happy to hear all your recommendations for cocktails, spirits, etc. based on brand, affordability or occasion. Prefer stuff that’s suitable without ice. Hit me with your best stuff. Thank you ladies and gentlemen.