The Canon is a sub-$100 lens even in great shape - make sure it comes with a viewfinder or you'll have to buy one. The Summicron in excellent condition can command ~$400, but they have soft coatings and are prone to have wear on the front element - check carefully. The body is the hardest to assess, since you can't really see much from the outside. Curtains may have failed as noted, and you can expect the beamsplitter mirror to have faded, making the RF patch faint or nonexistent, and old lubricants may have hardened, affecting the speeds and overall operation. In great shape with a recent CLA it might bring as much as the Summicron, but without it and in unknown internal condition, maybe ~$150-200 depending on cosmetics.
Budget ~$200 for a CLA on the body and ~$75 per lens if you're not able to do the work yourself.