Hi!
I'm 6'0" 44yo and 180lb. I'm a runner, surfer and mountain biker. I also recently developed achilles tendonitis and the doc says no running for 2 months

So I need to augment my exercise routine- you get into your 40's... and welcome to cross-training!!
I love mountain biking and have done it for many years, but would like to get into road biking. I have to keep it under $1k, and I don't mind used bikes. I've never road biked before- total beginner.
I'm sure this is a common question, but what kinds of bikes should I be looking for, and what size given my height and weight? Anything in a bike I should specifically be looking for?
Thanks!