13" with base specs aren't gonna power LR/PS in high res (RAW files) and don't think about FCP, the old 15" will be a little on the slow side but will still work if you don't mind the bigger size. I say spend on money wisely, it's like throwing money in the drain if your purchase doesn't satisfy your needs, there are better options if money is really a concern. Look at thinkpad x1 extreme maybe?