Which laser collimator?

I need a laser collimator and want some advice on which one to get for a 10" dob. I did have an Orion(which was about 2 years old) but threw the thing away because the laser wouldn't hold alignment. Are the new Orion laser collimators any better, or should I just forget about them? The EZ Telescope and Kendrick lasers seem pretty good, any opinions on these?

I have a 2" focuser, will a 1 1/4" laser be less accurate than a 2" laser because of focuser slop? Basically what I want to know is should I get a 1 1/4" or 2" laser collimator?

Well now that you asked! ;^)
The 2" will be more accurate because it uses no adapter to insert into the focuser.
The Lasermax and the Howie Glatter are both good. The LaserMax, though expensive, is probably the best on the market in my opinion. I like the holographic grid a lot better. It is easy to use and stays collimated. Very professionaly built and intuitive to use.
The hologram is very handy for focuser to diag alingment as well as regualr collimation.
I have attached a picture of the grid and how it works for aligning the focuser to the diag.
Floyd

Attached Image:

I've used both a 2" Teleport laser collimator and a 1.25" Orion LaserMate Deluxe Laser Collimator on my 10" Teleport. I much prefer the Teleport collimator with a target on it's face. It's very easy to use and once the reflection of the beam hits the secondary it takes under a minute to adjust the primary correctly. There is a picture of the Teleport collimator and a short overview at; http://www.teleporttelescopes.com/Collimators.html
The cost is the same for both the 2" and 1.25" models. If your adapter is spot on there shouldn't be any accuracy difference between the 1.25 and the 2", but there is less chance of error if you go with the 2" that matches the size of your focuser. The benefit of the holo pattern laser collimator over a single point of light is that the pattern is fairly large and easier to adjust under relatively severe misalignment where you might have difficulty finding a single laser point reflection.

I have a Howie Glatter collimator. I highly recommend it. Howie machines his collimators from aluminum, they are very nicely made and finished and hold collimation. A nice piece of equipment. I have had mine for probably 3 years and so far I have had no problems. He also is responsive will help you through it.

I recommend using the Nils Olaf Carlin "Barlowed Laser" technique for aligning the primary, it takes care of any slop in the focuser. In the past I have completely dissembled my 12.5 inch F4.06 scope and upon reinstallng the mirrors used the Barlowed Laser for the final collimation and found the scope to be spot on in use. Mel Bartel's page have the collimation by Nils. There is also a Sky and Telescope article on Nils' technique.

jon