Companion PE to Cape Town

Just want to check with the seasoned pros that I am not missing a trick.
I'm about to book a trip to Cape Town in Feb/March next year, and intend to buy a PE seat for myself (in S) for £1792. I'll then use my free Companion ticket from the black Amex to take my wife, paying the taxes of about £520. Will need to tack on an infant fare when he pops out in a month or so as well.
So all up around £2,500 for 2 adults and a 5 month old for PE return. Seems like a reasonable deal (vs £3,500 paying all cash).
Is there any alternatives I could/should be looking at? I don't want to spend any of my miles as I'm saving them for a SYD upgrade further down the line.
I'm about to book a trip to Cape Town in Feb/March next year, and intend to buy a PE seat for myself (in S) for £1792. I'll then use my free Companion ticket from the black Amex to take my wife, paying the taxes of about £520. Will need to tack on an infant fare when he pops out in a month or so as well.
So all up around £2,500 for 2 adults and a 5 month old for PE return. Seems like a reasonable deal (vs £3,500 paying all cash).
Is there any alternatives I could/should be looking at? I don't want to spend any of my miles as I'm saving them for a SYD upgrade further down the line.