The TM-1 will keep you pretty busy, it's what I started with from them and it's kind of grown on my as one of my favorite effects boxes. You won't so much feel the need to get more metasonix stuff right away as you'll want more things to feed the TM-1.
My favorite trick is to plug a roland SH synth into it, and send the Gate Out cv to the TM-1's VCA CV amp - it helps keep the signal under some kind of control while you rip apart the universe