I agree with all the 'get better tires' responses. You don't need to go hog wild, but good tires will make a lot of difference. Same thing with the inflation - lower than the max on the tire, and adjusted to your weight. Try to ride more times a week than 1. I'd say it's better to do 3 x 20 mile rides than 1 x 60, if that's every week, because you can go harder on the ride days and rest between them.
As you're riding and building up your mileage, your body will also be finding its place on the bike. There's a lot of information available online for setting up your bike to fit you and then adjusting the fit based on your individual needs. After you've been riding a few months, consider getting a professional fit. It might surprise you.
Save the $3500 till you've been riding regularly and you know what you want in a bike.
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