Hi . I would just like some advice on buying a usb projector , to be used on a laptop, and maybe ipad. It will be used to play some movies, but also to show some Office type documents (power point), this is just for 'play', not office. What are the key things I should look for ? Is it the 'native resoltion' , and luminens ? I am looking to not really spend more than £100 - as its just for home, and can see it become a not often used novelty ! But Id like it to be good enough to use. I have looked on ebay , but dont know if for example 480 x 380 native resolution is good enough ? http://www.ebay.co.uk/itm/Mini-Port...rojectors&hash=item5410acd9c6#ht_14237wt_1178 Also , would we need to buy a screen, or do these work ok on walls / large sheets ? Thanks in advance for any help.