If you can afford to spend a little more, consider choosing this Balenciaga Rollneck. While the price is very reasonable, this piece is an easy wardrobe update. It's also worth considering this Balenciaga Crew-neck Sweater. This piece is ultra popular and, just as importantly, not very expensive.
If you're gonna splurge, then you absolutely must check out this Balenciaga Poncho. This piece seems costly, but it's well worth it. While you're at it, also have a look at this Balenciaga Hoodie. Yes, this item is expensive, but it does not mean it's not worth it.