Gosh Dina, you have truly asked an impossible question to answer.
First of all a nice bottle of wine is the one you like to drink.
You can get a drinkable wine in the eight to twenty buck range, at least in my opinion.
Generally, to us, a decent red is cheaper than a decent white. Although we recently found a white we find very nice in the fifteen dollar range.
What you need to do is try some and discover what you like.
With wines there aint no roadmap.
And your taste for wines is yours. You are the only person who can tell what you like.
I wish I could give you a simple formula, and if I could find one I would abide by it.
There are a kazillion wines out there and the only recourse you have is your palate.
Try some, find what you like, and go on.
But I never buy a bottle of wine at a tourist place. They rely upon the people being on vacation and are free with their cash.