Chateau St Michelle Riesling, is my favorite, they offer it in dry, semi sweet and sweet, I prefer sweet, it still isn't really that sweet say compared to a Moscato, which I think of as sweet, around 8 to 12 dollars, at the wine store its 15 bucks. I think Gallo puts out a reserve called "Café Zinfandel" which is white zinfandel and merlot mix, which I have had for parties and it covers both white and red preferring a slightly dry wine. For big parties go for the box wine, put it in carafe or some fancy container, you could also throw in some fruit in the glass, looks fancy but won't break the bank. Also to make your wine go farther, mix with ginger ale, sprite, or puree up some frozen mangos, strawberries, or peaches add it to the glasses, pour over with White or a Rosa and garnish with mint, or the same fruit. I did this for my DD Bridal shower, and it was a huge hit with all the girls.
If you are giving as a gift, but best suggestion is to find out what the person you are giving for enjoys, wine is such a personal thing.