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Get him a chair!
Accessibility: Anyone can shop for a chair. You don't need to get into hardcore gaming specs to pick a really good chair.
Price: A really good chair is a lot cheaper than a really good graphics card. You want to get him something nice, right? You can pick up a quality desk chair for under $100. You can find computer parts for under $100, too, but it's not going to be nice.
Utility: Everyone needs a chair. Chairs are extremely useful and can really improve your computing experience. A lot of people neglect this point, and if your boyfriend spends a lot of time at his desk then a good chair is a must-have. I started having back pains in the morning after using a lazyboy for a desk chair for 6 months (indulgent, I know, but it happened to be the only comfy chair available for the job). It was so bad one morning that I went and ordered a new chair from Amazon the next day. I don't regret it at all.
The Chair I ordered. It's a great chair for a reasonable price. It's great for my back and tall enough for my frame (I'm 6'2"), and really comfortable to boot. Better chairs are certainly available. If I were to get a better one, I would want the same thing with comfy leather like I have at the office.