Some teas are decaf but in general the most common teas are caffienated. Even most decaf things are low or almost free of caffeine but not totally.
I suggest you try quitting coffee and tea together and seeing how you feel.
First, your comparison is opposite. The highest caffeinated teas have about 80mg per 8oz, while the lowest caffeinated coffees have at least 80mg per 8oz. Coffee will always be more caffeinated than tea.
Second, teas have tons of vitamins, catechins, phenolics and tannins, which your coffee does not. This is like quitting Red Bull and switching to a multi-vitamin that contains small amounts of caffeine.
All tea is made from one single plant: Camellia Sinensis. (Yes, one single plant!) The only difference between teas is how they are processed. Here is a flowchart of the different types of tea processing: http://upload.wikimedia.org/wikipedia/commons/1/13/Teaproces...
The healthiest tea to drink is "young tea" with partial sun, steamed instead of pan-fried (so Japanese instead of Chinese) and picked by hand, to reduce old pickings, inferior lower leafs and possible introduction of aluminum by machine sorters and fluoride by fermentation. For the most caffeine (and more traditional Chinese medicinal use), get pu-erh. http://theteaspot.com/about-tea.html
If you wanted to quit caffeine using tea, go from pu-erh to black, green, white teas and steep each a little less each time (or re-infuse the leaves for less potency and continued use). You can also drink herbal tea, which isn't actually tea at all.
Oh man I found it by accident, someone brought it in to work because someone else gave it to them and they hated. I tried and really liked it. But I also liked pickled and fermented things usually. I liked tea before but pu-erh is just its own category.
The other favorite is matcha. You get the tea leaves with the tea extract together.
From what I understand, steeping your tea very short won't help much in reducing the cafeine in it; cafeine enters the hot water in the first half minute. You'd barely have any flavour if you steep that short.
You can use the 4th or 5th leaf pickings, which have reduced flavor, antioxidants and caffeine. These elements are highest in concentration at the bud and reduce in content as you go down the plant, so don't get a bud-heavy tea picking like Silver Needles (an atypical high-caffeine-content White tea). The steep time and water temperature also dramatically impact flavor and the infusion of chemicals from the leaf into the water, which includes caffeine content.
And keep in mind that loose leafs transfer less content than broken-up or fine pieces. Also, between 2% and 30% of the caffeine content may transfer in the first 30 seconds of steeping - caffeine actually transfers slower than the antioxidants and vitamins, and never completely in 30 seconds (unless your water was still boiling, which is too hot for any tea!)
Another tip: don't disturb the water or tea infuser while steeping, remove it swiftly, and don't let the last drops from the kettle into your cup - they contain the most concentrated part of the tea.
So over time I developed next schedule: double espresso or two in the morning, one or two black teas after lunch/later, decaf black tea or camomile in the the evening.
edit: Black Tea near 100mg per 16oz.
From a tea site, not sure of its validity.
http://www.veetea.com/site/articles/caffeine-and-tea
Go to Caffeine in Tea: How It Works.
It looks like tea should not affect you as much.
Not 100% accurate, but it goes something like:
black → green → white → chamomile (which is naturally caffeine free if chamomile is the only ingredient)
Green tea in many cases has nearly the same caffeine content as black tea though.