Would you recommend a tomato variety for the Colorado front range please?

I have planted two tomato vines in large well drained pots for the last three years with terrible results. I tried what I thought was a hot weather variety this year thinking I would get better results. The plants had plenty of blooms but no tomatoes this hot summer. Once it turned off cooler, I began to get tomatoes and, in fact, having brought the plants indoor now have six large tomatoes growing on one vine.

Clearly I need a tomato variety for these hot 90 degree days and, perhaps, for this Brighton, CO altitude.

Any recommendations?

Thanks,

Clark