Clark W. Griswold
Join Date: Mar 2014
Location: ,location, location
Posts: 13,765
Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26
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Probably none of those bikes are good candidates for any upgrades but they are low initial cost bikes and it sounds like used bikes in some condition.
If you want a decent bike that could be upgraded look for something with air forks ideally from Rockshox, Fox, DVO, Öhlins, MRP...and ideally Deore derailleurs and shifters or above and hydraulic disc brakes. If you really and truly don't think you will get into it at all then get whatever but if you have an interest get a decent bike not just something to upgrade but a solid bike at the start so you won't be discouraged with poor components or a used bike that could use a lot of work.