Do we bite the bullet and book

[Going back]

Hello, really not sure what to do, we have accommodation booked next august from 9th to 26th so have been looking at BA fly drives... they are coming in over budget by a couple of thousand, however i then checked miami and we could go there, direct, on 8th and spend a night in a hotel before making the drive to the accommodation the next day. We normally stop in a hotel the night before we travel, but would just stop in Miami instead. 2 adults and a 15 year old is coming in at £4,300 for a fly drive ( which is a lot cheaper than Tampa or MCO)... is this price likely to come down, or do you think it will just increase so we may as well book now? Decisions decisions!