I have just (today) swapped my mk4 for a 430. It had done 134k with full Lexus service history(19 stamps), and MOT til next July. The cam belt was changed at 123k as were the plugs, transmission fluid, coolant etc. Everything worked except for temperature light on drivers side and the cup holder had stuck in.
Wheels needed attention but weren't too bad and had a couple of stone chips on the bonnet.
Looking at what other club members have paid I consider I got a good price having sold it for £2,250. I had asked £2,500. I was offered £2,000 in p/ex but had £750 knocked off the 430 with no p/ex.
On this basis I think £1750 is way too expensive for what you are being offered. ManicMark's value is much more realistic.
Pete