If you're budget-restricted, your best bet is this Sunspel Round-neck Sweater. It's a fantastic piece, while not very costly. Another strong contender for your wardrobe is this Beams Round-neck Sweater. While the price of this piece is not very high, it will surely attract a lot of attention. You may also want to look at this Y-3 Jumper. This item is not expensive either, but it will make a difference in your wardrobe.