If you see my post, down a couple from this one, you know how I feel about the SR-1, LOVE IT! I think you should go for it as the Lion Steels are constructed using the monoblock handle's, while the Spyderco will be built with two handle halves. Nothing wrong with that, it's just that the monoblock method is only being done by Lionsteel on the SR-1, and SR-1A, and is very unique, not to mention STRONG!
I haven't handled the aluminum model, but I do like the vibrant colors I've seen it in. It uses the same steel insert on the lock as the titanium model does, and from what I've read, it locks up just as tight as the titanium version.
My big reason I would pick the Lionsteel over the LionSpy is the construction method as I simply detest the new fad of using titanium for one handle, and G-10, or other, for the opposite handle.
If you could save for the titanium SR-1, you would find an awesome knife in your pocket!!