The wording can influence their response, so which way to ask is the best ?
I've solicited feedback on prices before and got what appeared to be very honest answers.
I agree that wording is very important. I think it's a very bad idea to mention any price at all because that will skew the results towards those price points.
Don't ask how much they think it should cost, but how much they think it would cost.
The wording I use is along these lines: If [name of product] were available today, how much do you think it would cost?
Using this technique I've had people answer from $0 up to $1800 for a practice test product. The most profitable price ended up being $20.
I think it's also a great idea to do some A/B price testing before you launch the product. Doing so might help you fine tune your prices.
Mark Paul has a video on this (if you can get past the dude eating right next to the video camera, but the content is great).
Start around 15:30.
To paraphrase, spend a good deal of time honing in what value your product brings. Put this in a survey and then ask them these 5 questions (in this order):
It is a good watch. I highly recommend it.
I think the answer is don't.
You set your own prices based on market research and what your product offers.
It's fairly obvious that you can lower prices, but it's less obvious that it's also okay to raise prices, as long as your give your customers fair warning in advance that you're going to do so.
Remember the price isn't how much it cost you to make, it's how much it helps the customer.
Here is a problem for you...
Ask a customer if they would like to pay $5 or $10 for x, they'll always say $5.
The best way is to test price points and go from there. You're looking at making the most money, so choose the price point and volume that makes you the most.