Can Anyone Help? Whats The Best Model For Power Gadgets And Reasonably Cheap To Service And Run? Is The 750i The Best? Or The 745i Sport? Regards To All Leigh

welcome, Leigh!
My personal rule-of-thumb is:
1. buy the newest car you can afford
2. get a PPI (Prepurchase Inspection done). Run a VIN service history check. Then use these applets to decipher:
http://www.tmk.com/defect-form
http://www.bmw-z1.com/VIN/VINdecode-e.cgi
3. buy an extended warranty
4. save this your FAVORITES: www.e38.org

Whatever car meets #1 and #2 above gets my vote. What are your "needs or intentions" for the car? Are you a DIYer or not?? I assume you have read the STICKY on top of this page. More good reading here that might help you decide:
http://www.motortrend.com/roadtests/sedan/112_0308_1995_2001_bmw_7_series/index.html
http://www.bimmerboard.com/forums/posts/17971

Generally, the 750 has "2 of each" something to keep in mind when stuff breaks.