Why do you automatically assume that if you get the Squier that it will require upgrades? Way too many people seem to think that just because it's an "inexpensive" bass that it's somehow lacking. Changing pickups will make it sound somewhat different,,,
You really should give it a chance before you just assume different pickups will somehow be an improvement,,,,Undoubtedly some will come along here and argue that point, however anything gained there will be incremental at best.
Generally stock Fender/Squier tuners will give great service life and hold tune just fine. perfectly good working mans instruments in stock form and just because they're "inexpensive" doesn't somehow necessarily mean they're "cheap". Give it a chance