If you're looking for something in between pricewise, why not check out this Marc Jacobs T-shirt. While the price is very reasonable, this piece is an easy wardrobe update. You might also want to consider this Marc Jacobs T-shirt. It's an attractive option both price and quality-wise.
If you're gonna splurge, then what you're looking for is this Marc Jacobs Crew-Neck Tee. It's more expensive but worth your money. While you're at it, also have a look at this Marc Jacobs Tank. Yes, this item is expensive, but it does not mean it's not worth it.