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i'd honestly pay the extra $60 for the newer version. you lose the dedicated graphics, but you get thunderbolt 2 (potential to connect to a 4k display), slightly better battery and faster flash storage.
 
4k Display?

I'm not planning to buy a 4k display any time. Would the Thunderbolt still factor in?
 
I'm not planning to buy a 4k display any time. Would the Thunderbolt still factor in?

Factor in on what way? If you want an apple display you'll use the TB interface. If you want to use a non apple display you'll need to buy one with a mini-displayport or get an adapter.
 
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