I agree with starkler, get a cheshire.
Have a read of
this site and look at its products, read the links and FAQs etc. it will give you a good understanding of what each tool does and how to use it..
I want to purchase the
BlackCat + Infinity Twinset (2" set), US$126.
Not cheap, but if it means you KNOW and are SURE your scope is collimated, then it's probably worth it.
The GLP is just a toy, and while it's fun and great to use, it's not that important when you're own your own. The Telrad is in the same boat for me.. a nice to have but not that important.
I'd get the barlow.