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At this time I hope to avoid having to use my laptop outside to 'control' anything (so no EQMOD, etc)
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That's going to be really hard. I've never been able to go beyond ~30 sec exposures unguided.
I wouldn't recommend the Synguider - I know someone with one and they soon replaced it with an Orion SSAG and PHD.
You can pick up a QHY5 (which is identical to the SSAG) second hand for around $200 and PHD is free. If you can put that together with your finderscope to make a finder-guider, which can be done for the cost of an adapter ring (available for some finderscopes), then you could have PHD guiding up and running for around $250.
Also, using a laptop with Backyard EOS gives you more control and visibility of your Canon DSLR than an intervalometer, IMHO.