Hey again Roddy
I agree that it's the way you design, not the program that you design with, which future proofs your website. However in order to do "future proof designing" you need a program which is capable of doing so.
A basic drag and drop program can't do this, at least not in my view. You need something that is going to allow you to start at the very basic and advance as you learn, or as standards and technology changes.
There are still many businesses and corporations out there using IE6 as their default browsers, so writing off IE6 detection isn't really a valid option either. At the very least you want a basic text page to show saying "you need to upgrade your browser to IE7 or later", and giving a link to the relivent Microsoft site.
Of course it's best practice just to code your site so it alters layouts and colours and text styles to be comparable with IE6 if that browser is detected.
The most important thing in modern web-design is designing for a mobile browser on smartphones and tablets. In the past I would have said you need to have a mobile specific site such as, m.domainname.com. However, in today's world, I think it's far more important and much more professional, to simply have a responsive design, that changes from navigation bar to menu and resizes the text, graphics and page, when a mobile device is detected.
Again simple drag and drop program's are not able to fully implement responsive designs (although rapidweaver does a good job with some of its responsive themes) the downfall of this, is that you are back to paying out $35/$40 for the privilege.
Several months ago, when I was looking to move from iWeb, due to the discontinuation of MobileMe, I was in the position of feeling quite desperate because I didn't know any coding. I didn't know how to write HTML and was almost in tears when it came to implementing CSS. I stuck with it however, went to an evening class in website design and bought books and learning resources to work through at home.
Now I can use dreamweaver with relative competence, and although I wouldn't say I'm professional (I still need my books sometimes) I can write HTML and deploy CSS with confidence and am now moving onto designing a more complex website that includes multiple subdomains an e-commerce solution and php linking a MySLQ database for members access.
It's not always best to just think small. Where it's important to know and accept your current limitations, in my view, the second important thing in modern web-design, besides ugh, design, (whether you are a seasoned pro, or starting right at the beginning) is to give yourself plenty of room for growth and expansion and not to cobble yourself with something that's going to be too basic and cost you more money in the long run.
Rapidweaver, would give plenty of scope for learning growth and expanding ideas. I have used it and it's an excellent program as an intermediary. Like I said though, I've now moved on to more advanced design nd have adopted dreamweaver, which I get as part of the adobe creative cloud.
I don't have any links to either company other than I'm a happy user. That is the sole bases for my suggestions