All listed should be pretty reliable power.
The 454 is too small
502 Mag good choice
HP500 as long as it is an EFI....good choice..I like efi and so will your gas card.
525SC is a blower motor which I would tend to steer away from but still not bad.
Your reliability issues are most likely going to be drive related in a boat of that weight. The engine packages will be Bravo boats so look for the newer xr drives.
HP500efi w/ XR's is what I would look for out of the options you provided.