I've been training on my resistance rollers with my DF for 25 years. Get the resistance. Rollers without a resistance unit are much more limited. It's a lifetime investment, lots of time for amortization.

You saw that Sportcrafters makes a resistance roller set "just for you," right? I ride 1,000 miles or so on my rollers every year.

Besides not freezing one's butt off, indoors saves a lot of time. Put on shorts and shoes, turn on the fan, and away you go.