Car selling advice!

I'm currently mulling over the possibility of selling my BMW and getting another car on a lease for financial reasons.

The trouble I have is that I have to put my name down three months in advance for this lease car and when I take delivery i'll also still have my BMW which I will need put straight up for sale.

The question I'm asking you lot is that do you think that I'll get rid of the BMW straight away as I don't want to be paying the lease costs and the personal loan at the same time as i simply couldn't afford to have the two cars.

The car is a 1999 BMW 323i SE Saloon, and will have covered no more than 60,000 miles, with a FSH, albeit with the last inspection carried out by and Indy.  It has all the toys and upgraded Clarion MP3 Player, 1/2 leather sports seats and a MFSW, also comes with a tracker fitted and a private plate worth approx £395. In three months time I'll probably be asking around the £6500 to £7000 mark for the car, which is basically enough to pay off the current personal loan.

One thing that may put people off is that it has a replacement Instrument cluster which shows approx 10k miles less than what it has done, although I do have the reciept from when it was changed and the old broken cluster.

So in your opinion would I get rid of it without any real trouble, and where can I put it up for sale that would generate the most interest?

And before you say it, i know will miss the BMW, and when I manage to sort out myself financially, i will be in the market for a new 2nd hand 3-Series as it is simply the best car I've ever owned or have driven.