I know what you mean but this is all business... Treating myself to 2 nights in a hotel I am only sleeping in for $350 to play a tournament that costs $550 is gonna really eat into my ROI and hourly, and in comparison I'm spending £600 on 30 nights in the house so £200 seems a lot at the start of the trip for 2 nights. Sorry that's just me being a tight nit in my late 20's

Could write a couple of books on this topic, but won't derail.
There's abs nothing wrong with saying that you want to keep X's down (there are diminishing returns from screwing things down below a certain point) so let's rule out Palazzo/Wynn.
Trump, TI and Harrahs are all as near as damn it equi-distant from Wynn.
Harrahs is $107 total - this includes all taxes, resort fees and everything.
TI Marky is quoting as $135, dunno if this was including RF + tax or not. (The rate I can see is $177 all in)
Obv hotels are subjective, but given your remit, if $135 includes RF and tax, then TI for $135 is better value than Harrahs for $107. If it is $135 + RF + tax, then Harrahs is better value than TI.
Trump is $230 all in, but given your remit, maybe scratch that from the list.
I wouldn't put anyone off staying at TI, I think it's a very good hotel for the $. I also woudl stay at TI every single time if the choice was TI or Harrahs (but my remit is different to yours) But if saving money is king:
TI for $135 >> Harrahs for $107 >> TI for $177.