Am I getting screwed by the dealership service dept?

2006 chevrolet corvette 105k miles. Was in for service 2 months prior and
with the car on the lift to replace a tire, the tech showed me a power
steering fluid leak which I knew about. No other leaks at the time and when I
picked my car up, I was told everything else was fine. All of the hoses were
fine, I kept the car in great condition, and the only thing they recommended
was eventually replacing the serpentine belt.

All of a sudden last week, it started overheating and dropping coolant. After
cooling down, I added 2 gallons of coolant which went right through. I had it
towed in and this is what the service dept told me. My original guess was the
water pump:

Replace heater hoses (soft)   $440
Replace resevoir (leaking)  $231
Replace radiator hoses (both leaking)  $392
Replace resevoir hoses (soft)  $160
Replace thermostat $208
Coolant hose clamps $65
Total after $60 shop supply and tax------$1665

I feel like Im getting screwed and I would like to make an informed decision
on what to do before I authorize any repairs. Since I cant drive it, it would
have to be towed to another mechanic for a second opinion. That,
combined with the loaner they gave me for convenience, is what I think
theyre banking on for me to just say yes. Any advice would be grateful