Would you recommend the DS-2CD2142FWD-I ?

How many cameras does OP want?

If it's 6 then get DS-7608NI-E2/8P and save the cash, that's a no-brainer for me. If it's 8 then better to get DS-7616NI-E2/8P or DS-7616NI-E2/16P can have more room to grow.

If you're getting any 4K cameras then splash out on DS-7616NI-I2/16P
 
That's been fixed for the 7608NI-I2 with the 3.4.82 firmware revision where they have changed the RAM allocation boundary between the CPU and the DSP, which they got a bit wrong first time round.
Good to know
 
Thanks all for your prompt replies.

I will go for DS-7608NI-E2/8P ​I only have 4 cameras and will have an extra 4 ports.

Perfect, with the money you've saved get decent solid copper Cat5 cable (not crappy CCA). That's more important than any of this stuff.