I prefer my wine at room temperature. Darker wines are preferable. Any suggestions. this is not just for me. I hope your suggestion is available in the U.S.A.
Like asking “best” cartridge under $500 (pick a price point). One thing I have learned in my oenophile evolution is what makes a wine good or great is completely up to what you like in a wine. Under $20, from most USA producers, you will find what I call fruit bombs, hitting the tongue with explosion of fruit flavors, often times too much sweetness. But there are many good cabernets from Washington state around $20/bottle. If you like a little bit of chocolate flavor in your wine, cabs or syrahs from Walla Walla area of Washington tend to have a bit of chocolate notes.
If you are less inclined to a big fruit forward wine, French bordeauxs are much more earthy wines (I call them “dirty”) and you get much more minerality and less fruit. These pair very well with beef. I find Itialian sangeovese (Chianti) often has both fruitiness and minerality, but are a little lighter than a bold cabernet for example. You cam find Pinot Noir that is nice at your price point, but watch out as many are quite sweet and bursting with raspberry, strawberry, and pie cherry flavors. These can all be nice for folks new to wine or who don’t care that much what is in the glass.
I often use the rating feature at “total wine and more” website when stocking up on what I call mid-week, pizza night wines. You can filter for ratings, price, region, and varietial and get a many selections that will be very good. Try for example to see if there are any wines rated >92 points for less than $20. Make note of a few labels and the vintage and see if they are on the shelf at a local grocery. Ratings don’t equate to total quality or if you will like it, but a wine with a rating over, say, 92 points probably will be enjoyable. french, italian, north american, south american, australian… so many to choose from.
Personally, I am always looking for the great value sub-$20 bottle, and often find some gems in the $15 neighborhood. I stock up on these as they are great to have on hand when I have guests who are not wine connoisseurs but enjoy a glass when listening.