It's ideal to keep working on surveys and saving points for better rewards equivalent. The merchandise online store has wide selection of items redeemable to even as little points. You may always take the chance to browse for items you like to see how much points it takes to claim the item.
In any case you don't find items you wish to get from your survey sites, that won't really be much of a problem. The e-certificates, e-cash and other rewards certificates might be able to cover that item yo wish to get somewhere else. It might not be the direct item from your survey site but still you get to have that thing for free with your claimed survey points.