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I went the cheap and versatile option. A long time ago I had a 201xt autoguider that I couldnt get to decent focus for autoguiding. I bought the ronchi screen focuser for the 201xt and guess what it worked perfectly first time right out of the box, but then I did something sneaky. You can use it to test your opticss like any ronchi screen and with an eyepiece parfocal ring set it up for your DSLR. I found perfect focus for my dslr, then used the parfocal ring on the ronchi focuser to get the correct spacing. Now it takes 10 sec to get perfect , repeatable focus for the dslr.
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