@bagsmom Consider this..... Almost everyone with a pond wishes they'd made it bigger. So, when planning [sorry, can't help with the spousal issue] it's a good idea to plan for "bigger" on the first go-around. IOW, go as big as your space and budget will allow [liner will be the biggest initial expense]. But you can also plan for adding extensions and feeder ponds where all the ponds are connected by streams or waterfalls -- assuming your yard is big enough.
@JoshHemminger We rented a mini-ex when we dug our pond and couldn't have done it without -- a true lifesaver!