Those mileages sound more like it to me - good luck - looking forward to your news.
For what it's worth(!), I apply a simple age/value formula (for want of a better term) when deciding if an XF is priced right:
Assuming good all round condition, low/average mileage (around 50k or less as a benchmark), good history, clean interior, good tyres (& wheels), and a decent amount of tax & MOT if poss., I reckon most XFs are worth about the same figure as their year: i.e. 2003 (53) £3500; 2004 (04) £4000; 2004 (54) £4500 and so on, geddit? Of course, even a nice low mileage 2007 @£7000 would be getting a bit steep in today's buyers' market (and is getting close to SRT prices) so apply a little discretion.
Obviously, if the car is great in all respects for its age but has higher miles, the price comes down, so it's only a rough guide but gives a good starting point and anything below those guidelines is starting to look more like a bargain.
Coupe vs. roadster and auto vs. manual don't really affect value too much as they are such personal choices (IMHO but living in Scotland, I'm not an open-top fan!) - and the rarer but controversial Cedar (red) interior only adds a little value to those who really like it (which I do - wish I could put one in my SRT - or is that sacrilege?!) - those who don't will see it as a negative. I heard of one buyer who told a seller that nobody liked them which is why they didn't make many, so he used it as a bargaining chip to get another £300 off the price! Sometimes it pays to be cheeky!