Work as a web dev so might be able to point you in the right direction!
People often start out looking for websites because "we need a website". Most important is to think about what you want the website to do, who you want to visit it, and what action you want them to take. If you plan from the start that you want users like X who are likely searching for Y, and when they get to the site you want them to do Z you'll end up getting much better results. A large part of the reason that bespoke websites cost a lot is because of the user analysis that goes on way before any code is written, so definitely think about this before you start as it will determine everything from page layouts to what keywords you need in titles and content.
Wix works okay, but we get a fair few clients who come to us having tried to set something similar up themselves and finding that it either looks nothing like the demo sites they show you or doesn't end up getting the results they want. Worth a try, but very basic and if you put in a little effort you can achieve much better results for not much more price wise.
Mynight's HTML template suggestion is a good one if you're up for a little reading/trial and error, but I've also seen a people make a hash of this too. Often it's browser and device compatibility that catches people out here, so if you do go down this route be sure to check on as many device/browser combos as possible. You'll have more control over search engine optimisation etc., but editing content later would mean updating code. Not generally a problem if you're always going to be on hand, but may be tricky to hand over to your other half completely if they don't fancy the learning curve.
The other end of the scale would be to see if there are any web dev companies that offer template based startup websites - we offer a five page package where we take your content and whack it in a pre-built website and change logos/colours etc. to match your branding. Chances are the website hasn't been designed specifically with your target audience in mind, but you do get the comfort of knowing that it's been designed and tested by professionals. Where I work, these templates usually come about when someone has commissioned a bespoke website and then cancelled the project half way through - so although they're a lot cheaper than getting something made bespoke, you still get all the benefits like carefully thought out SEO and a content management system to update the site at a later date. These tend to be around £800 (near us at least). Probably not the best solution in this case, but worth keeping that figure in mind if you're signing up to any sort of monthly site builder or buying themes etc.
I'd probably suggest looking at Wordpress - find yourself a nice theme on themeforest and spend a while learning to customise it. There's shedloads of free tutorials about to get you started, and would be dead easy for your other half to update later on if they need. I'd recommend finding a theme that included Visual Composer (page builder) and Slider Revolution. I reckon this is the best middle ground here just because someone else (hopefully a professional) has written the code and worried about things like device/browser compatibility, but you still get far more control over page layouts than you would with a template.
Hope some of that is useful - apologies for the wall of text!
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