If you just have the intention of making a 3D game, one that's not too graphically intensive (i.e. not like Crysis), then I think it would be better to invest in a laptop so that you can make your game on the go. On the other hand, if you're planning on making a graphically demanding and/or using this PC to play the latest and greatest games, then build yourself a nice gaming PC with a good CPU, GPU, and RAM (8 GB is good to start with).

If you just have the intention of making a 3D game, one that's not too graphically intensive (e.g. Crysis), then I think it would be better to invest in a laptop so that you can make your game on the go. On the other hand, if you're planning on making a graphically demanding and/or using this PC to play the latest and greatest games, then build yourself a nice gaming PC with a good CPU, GPU, and RAM (8 GB is good to start with).