You can expand any Apex model to get any feature offered by the higher models. It may or may not be cheaper in the long run to buy a more expensive model now.
For example, if you think down the road at most you'll add is pH then an Apex Jr. + pH expansion module is cheaper than an Apex Lite. If you think down the road you'll need pH + 8 outlets + VDM + display then the Apex Lite or Apex will be cheaper.
All depends on where you will go, but at least you won't have to throw away your initial investment regardless of your decision now.
Also these Apex units are rarely sold used and keep their value compared to most electronics.
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