If you were asking about an off the shelf bat, if it taps up well and feels good in pickup/weight then £200-250 max as a one-off.
As above. Most I have ever paid was £250 in 2012 for that year's Kookaburra Kahuna Players. Used it last season and this, very pleased with it and feel it has made a positive difference to my batting. Has also proved to be a good deal as they are rarely seen new below this.
£250 is probably still my current maximum budget, personal decision based on factors such as financials, enjoyment of playing (high) and playing level (not high).
Definitely very good new bats around for £150 particularly when big brands are discounted (usually starting from around this time of year), plus the makers on the forum that can offer consistent value all year round and quality at this price point.