Tranquillidad-
I haven't tried or seen the Loomis, but it sure sounds like it's a faster taper than the Signature from your bend test.
TFO makes some very good rods for the money, the Signature is one of their entry models. It might be a tad easier to learn on (softer action), but the Loomis sounds like a rod you could grow into, with more potential as your casting improves. The TFO might start feeling a little noodly with longer lengths of line. If the Loomis seems too fast for you now, you could overline it to slow it down a little as you are learning, although the Rio Bass should be fine. (And you chose an excellent reel BTW.)
I would be surprised if the Loomis didn't have better components (blank, guides, reel seat, cork) and fit and finish (guide wraps, coatings) than the Signature, but don't know that for sure. Although the GL2 is their entry model, Loomis is one of the leading fly rod companies and arguably make some of the best stuff out there (their GLX is a hot rod). And at least one fly fishing school I know uses the GL2 as their class rods.
You can't always judge by price, but the TFO Signature at list vs the Loomis at a significant discount for a few bucks more.... I'd say you did the right thing and it sounds like a good deal to me.
I hope GL2 users weigh in with their comments...
peregrines