Egg Transfer - 1 blastocyst or 2

For the last few days me and Dan have been debating whether we put 1 blast in, or 2??! *SCREAM*

1 BLASTOCYST TRANSFERRED
Positives
Single pregnancy
Leaves 3 blastocysts, if we want to try again

Negatives
Increase chance of it not working
If it doesn't, we have to find another £1050 to do another FET cycle

2 BLASTOCYST TRANSFERRED
Positive
More likely to get pregnant

Negative
We lose 2 blasts in one go, if unsuccessful
If successful, we have 3 children under 3
Possible chance of triplets (one blast splitting - happened to an IVF friend)
Twins could mean increase chances of complications

Really not sure what to do.. I guess the logical thing to do is go for SET (single embryo transfer)?!

*SCREAM* Consultants appointment is nearing, I need a decision soon :-/