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At 250mm, you're certainly going to have to put some effort into polar aligning whatever mount you choose.
The Star Adventurer can only be guided in RA. I'm not convinced this is a big deal, since if you're on the precipice of autoguiding, you're going to do the above anyhow. It's certainly small and capable, within its payload capability.
FWIW, you're not going to put THAT big a reflector on a HEQ5, they scopes just get heavy fast. Beyond 8" you want to be thinking EQ6. But I reckon you could get a lot of satisfaction out of a small(ish) refractor and a HEQ5.
The 120MC isn't particularly sensitive for guiding or planetary, although it might have been considered so a few years back. The 290, and its bigger pixelled brother the 224, are much more sensitive..actually, current pack leaders. No free lunch, unfortunately, but buy the best you can afford, the food will last longer.
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