Decks, Patios, Porches and Docks - Rot damage repair

I've done repairs like this before, but I'm searching for better ways to do them.

In the past, I would use a wood hardener (typically minwax) then fill with a polyester/fiberglass body filler. This works, but since the body filler doesn't expand and contract like wood, the filler will eventually lose it's bond. If the rotten wood isn't removed in such a way that the remaining void prevents movement, I might get a call back and find a big chunk of filler laying on the ground.

Recently, I saw a product used on an episode of This Old House. It would be exactly what I need for the most common rot damage repairs I encounter. However, it's not cheap. But, a 30 minute work time, and the ability to expand and contract with the wood, would make it a worthwhile investment.

Before I spend a day driving to the nearest retailer (I'll need it sooner than it will arrive by UPS) I'd like to ask if anybody knows of a similar (but less expensive/more easily attainable) filler that performs better than the traditional wood hardener/body filler combo.

Here are a few links to some products listed on doityourself.com, a link to the system I mentioned, and a link to a couple photos of the rot damage I'm getting ready to repair:

Would any of these types of wood fillers be appropriate?
http://www.doityourself.com/invt/7191570
http://www.doityourself.com/invt/8555922
http://www.doityourself.com/invt/u498626

The system I mentioned:
http://www.advancedrepair.com/architectural_epoxy/artssystem.htm

And finally some photos of some rot damage I'll be fixing soon:
http://www.katanapg.com/group/2281

If you're thinking that I shouldn't waste time with fillers on the base of that column, we're on the same page. I'll probably just rip it off and replace it. Also, I can justify the expense of an epoxy system like the one above, because I do a lot of rot damage repair.

Any thoughts, tips, help would be greatly appreciated!

Thanks,
Jeffrey

The door and the column -- I wouldn't try to repair them, I would replace both of them.

Yeah, you're right. Turns out that there isn't any solid wood at the base of the door, so I'm going to have to replace the rotten parts to keep the door structurally sound. It takes a little longer, but it's more fun to do a little woodworking than patching. :)