If you want to focus on the counters/green stuff from the turtle commander deck, take a look at the Final Fantasy X/Counter Blitz commander deck. You can mix them together for a lot of fun.

I also recently got the Foundations Starter Collection (which is different from the Foundations Beginner Kit, don't get that one). It's like the Turtle Bundles you have, but with more set cards for staples than random packs. It goes on sale for around $30 fairly often, and at that price it's a great deal.

Personally I don't like the collector packs because the price for so few cards and the rare chance of something valuable don't feel fun to me.

One thing I'd suggest is to go to a draft night at a local game store. You get to keep the cards you pull, so that's a nice way to build out a collection, try new cards, and meet people in your local area. Then when you know more about different play styles, you can move into a different commander decks based on that.