Or base model i3 with Apple upgrading the SSD to 256GB? But then I would need to add RAM on my own sometime in the future (if I feel that 8GB is not enough).
This would be a really bad value, if you really needed 256gb ssd, then the $1099 i5 base is the best value there, there is even a discount on it right now for $999 at bhphotovideo.com.
I think that podcast's assesment between i3 and i7 makes sense if you compare the base config i3 vs the cheapest i7, the minute you try to upgrade ssd on the i3, it's a bad value, you should go with i5 if you really wanted that 256gb.
What I did personally was, I chose the i7 and went with 128gb, which is enough for the OS, and then use an external SSD for your home folder.
Sure, the 128gb doesn't have ridiculous speeds, but who cares? I personally can't notice it, and you won't either for non-pro use.
Here's the issue with going nuts with configs and mac mini, the minute you start building up into an i7, more ssd, etc, the cost is so high that you'd have to really think about why you'd choose a mac mini when you can go iMac. You'd need a very justifiable specific reason.
This is one of the reasons I strongly believe the i3 stock with 128gb would be the best value, because you keep costs down, you get nowhere near iMac territory in terms of cost, and yet you still get a great system.
Resale value on that stock i3/128gb should be pretty good, a lot of people like to use these as htpc and/or home servers, so the cheapest stock config would be the ideal candidate.