The nearest compatible late 2013 looks like this:
E2013: $1899 i7-2.7 16GB 512GB GT650M
L2013: $1949 i7-2.3 16GB 256GB Iris Pro
I know there are some speed improvements for the SSD and battery life improvements, but are those worth paying slightly more for half the space and 15% slower processor?
Clock speed does not mean slower, its probably closer to nil as Haswell is about 10% faster than Ivy. The Iris Pro is equal and in some cases faster than GT650M (and yes some slower). A L2013 GT750 can be had for much cheaper now, especially with new models for much cheaper and its the entire package, pcie SSD, wifi AC, TB 2 will matter in resale or in keeping machine current long term.
I ended up selling my 2012 15 rMBP that I got for a steal as soon as the Air came out because I knew this hardware would last in value and use for many years to come. I ended up going with L2013 13" 512 because I cared more about battery and portability for my laptop.
I'm glad you got what you wanted, but for that overall price, you should buy current state hardware.