A friend wants to buy my old tv off me but we dont know what would be a suitable and fair price. It is a Philips 28 inch widescreen, 50 hz. Blackline S tube. Straight Nicam stereo and fastext. Model 28PW6322. No extra frills. Good basic quality. It is about 4 years old and in perfect nick. What would be a fair price to both of us?