Ive found a Archos 101 at £149.00 at Car phone warehouse...Seems to get reasonable reviews, ok its not an Ipad however its less almost a 3rd of the cost. I know this unit has been superceeded now with the 101 G9, but again thats twice the cost.
Car phone warehouse also have the Arnova 10 G2 at £139 looks great value but lacks a hdmi port.
Get an Advent Vega and put the vegacomb rom on it, google it on YouTube and the modaco forums. Turns an average tablet into an amazing device. Bought my 60 year old Dad one for Christmas and he loves it.