Well, as mentioned by a few members in this thread, there are a few cars that are not mentioned in this poll. The most obvious contender is the MP4-12C (sp?

). However, for £140-160K, you can also add the LP560/Balboni to this list.
That being said, price should not be the only consideration that determines which car one should go for; dynamic prowess is also important for a sportscar, no? This is where cars like the Porsche 911 Turbo and GT2, perhaps even GT3 could come into play. Although I am not Porsche's biggest fan, their heritage and racing history is almost unrivalled and as far as instantly palpable factors like feel and handling are concerned: the 911 is unparalleled.
Of course, you can't mention cars like the 911 and not mention the Dark Knight from Japan, the GT-R - yes, I'm coming out of the closet, I like the GT-R! The one car that you could put unashamed confidence in to run rings around the others and make their price-tags look like random telephone numbers chosen by the bean counters as opposed to reflecting the vehicle's intrinsic worth.
As far as my particular choices in this poll are concerned, no doubt the Ferrari, perhaps even the Mclaren, will obviously be the most fun to drive. The mid-engined layout pays dividends with exquisite steering feel and delicate handling balance - the R8 in these respects lacks that ultimate feel, (although I personally love the car.) Despite these factors, and considering all the cars here and those not mentioned, if money literally was no object, I think the SLS would suit me. Why? Its simple, elegant and so different from all its contenders that it appeals on an emotional level. People love different cars for different reasons; I just prefer the SLS.
As for the LF-A: I don't like this car at all. I'm sorry but the car does nothing for me. I'm not a snob (said the Mercedes fan

), but this car does not look good and is simply way, way too expensive for what it is. I also personally don't like V10 engines [shock and awe!]

I really do not have anything else to add in this respect; I'm so seriously apathetic its not even funny
