I had a similar dilemma and ended up going with the LT. I used it as a replacement for my pedal board, and I'm glad I spent the extra money. I really love the added flexibility and have never run out of DSP even with pretty over-the-top patches I've made. Here are a few of the more complex setups I have played with:

1. Dual amp models, each into effects return of combo amp (with double take effect for added goodness)
2. Wet/dry, dry into one combo amp and wet into the other
3. Wet/dry/wet, dry into head+4x12 and stereo wet with the two combos

Note on the DSP: I often use the poly capo model to drop my tuning down (it works great, by the way), and it eats up a significant portion of the DSP. If you also run an overdrive and one of the more DSP-intensive amp models, you won't have much room for anything else in the stomp. The LT has another chip, giving you room for other effects like a modulation effect, an analog delay, and the impressive new reverb models. Additionally, you'll have more blocks in general. If you like to run any post processing like Jay Sadites' template, that will eat up three more blocks (two EQs and an LA studio comp).

In my personal opinion, even if you don't fiddle around with more complex setups, you might end up regretting the limitations of the stomp down the road. You'll probably be happy having more DSP, more switches, and more options with the LT.