Here are some of the differences between different 1011s that I haven't noticed on the thread.
The one in BKK is a -1, with 22B engines and no center tank, they are the cheapest to buy (ex-Tradewinds).
-100 has 22Bs and center tank, -200 has 524s and center tank.
-250 is actually a -1 with 524 engines.
If you are really looking make sure that they have already done the spar mod, very expensive.
Also different take-off weight for different 1011s, the most I've seen on a non -500 is 474,000 lbs. with beefier gear mod.
It has been a while for me since I've flown one so please excuse any mistake. All this is from off the top of my head.
Have fun shopping.