Lenovo A740 27-Inch All-in-One Touchscreen Desktop
The 4th Generation Intel i7 quad-core processor in this computer is quite good and offers tremendous speed and performance. You get 8GB of RAM in this system which is a little less than would be ideal, but it should be more than enough for most tasks. However, there is the addition of an NVIDIA graphics chip with 2GB of dedicated video memory so you'll be able to run a lot of PC games and other demanding software on this system fairly easily.
It has built-in stereo speakers that are pretty good for an all-in-on system and a 27-inch touchscreen for optimal navigation. The 1TB hard drive gives you a good amount of storage and you can pay a bit more for a model with an 8GB solid state drive for your operating system. Although this system comes with an external DVD burner which can’t play Blu-rays, it’s still a valuable tool for reading from/writing to DVDs.