Full disclosure: We are a consulting that specializes in Intranets and SharePoint. But I'll give you an objective answer. $30-40k would be a pretty small investment, IF you want it to be successful long-term. We have done hundreds of implementations and speak frequently on the causes of project failure. In fact, 60% of our new proposals are actually to companies who already have SharePoint and are coming back to us for project rescue, or what we now call CPR. This is 60% of our work, so ye, the failure trend is alive and well. I say all of that to say that it doesn't have to fail, but as a rule of thumb, we put 80% of the investment (time) into what we call planning and control. We call this our 40/20/40 principle. 40% on planning, 20% on technology implemention and 40% on control of the project.
The technology "configuration" will be the easy part. It's understanding your audience (PEOPLE) - the users, personas, how they work today, how they prefer to work tomorrow, etc. You want whatever you build to be "in the flow." In other words, it shouldn't be yet another system...it should be friction-free and easy, and a part of their normal routine and flow of their day. This drives adoption, which drives engagement, which drives sharing and collaboration, which drives innovation, ...and it goes on and on. In short: If you build a great Intranet with all the bells and whistles, and no one uses it (or uses it very little), then what's the ROI? Zero. ROI comes from the use of technology, not technology itself. That's one major component - the people.
The other component is, "Why are you doing this?" We've got thousands of questions we ask clients to help them understand what is driving this, but you have to answer these questions. What does an Intranet mean to your organization? Is it a place where users get the latest news, or a place where people are social and collaborate. What about document management? Anything else? Integration with other things? Dashboards? Reporting? You have to define what it is to your organization.
Sorry for the long answer, but we are super-passionate about making sure these projects are successful. It's why we exist. We have developed specific methodologies for the planning and control of these type of projects - they are different. We've also got a ton of tools and resources on our website and you can see most of our presentations on YouTube or SlideShare. I'll put links below.
Can you get an Intranet for 30-40k? Yes, but is it one that will add any value? Reach out to me any time.
Best of luck,