The V40's came with shafts but became so expensive new in comparison with sterndriven version that Princess stopped offering the option on the 42.
Next question why shafts?
Maintenance and manouverability are the main reasons but on the downside you have reduced performance and increased (substantial) fuel consumption.
The manouverability question is also borderline as I have helmed both and although different I actually prefer the sterndrive. At least you can point it and squirt.
MBY (October issue) have a great feature on V42 (V40 is practically identical) and they go through the main points although they do quote the shaft driven version as being slower by about 1 knot where as in practice the shaftdriven version is around 6 knots slower but they do have the reasons for this reduction in performance correct.
Now the maintenance issue. The bigger, heavier Volvo 63's (I think) in the shaft driven option rev at around 2600 max and therefore are never driven as hard as the 44's (42's in earlier boats) which go to 3900. Having said that the 44's are a well proven unit and in practical terms the maintainence cost will be higher on the larger engines although it is likely that in the very long term a failure is more likely on the higher reving 44's than on the 63's. The Sterndrives will require routine maintenance but owners I have spoken to believe that the running costs of the shaft driven boat outweigh those of the sterndives if you include fuel on a boat doing 100 hours a year.
V40's tend to attract around a 10k premium for the shaft driven option that originally added around 40k to the new price so at first glance that appears good value but the reduction in performance is a heavy price to pay.
PS mine is for sale advertised in this month MBY classified. Lying Poole. ;-)
How much do you want to spend? Secondhand, I can think of Princess Riviera 36 or 406 as well as V42, Fairline Targa 41 or 42, Sunseeker Mustique 42, Cranch Mediterranee 41. All will be early-mid 1990's for £100-130k except the V42 which will be newer and more dosh. Bigger, you could also look at Princess Riviera 46 or Sunseeker Camargue 46 for the same money
Obviously it depends on the engine configuration. If you are prepared to go bigger and bigger engine wise to obtain the necessary Horse power then anything is possible but with the V40 (see november MBY) 340 additional horse power in the shaft driven option fails to match the Sterndrive for speed.
It is also fair to say, (again MBY November) that the V40/V42 is a suprising boat in terms of speed reaching 38 knots on sterndrives. It is of course possible that the Sealine with the 44's is only capable of say 31 knots due to other factors such as weight distribution and hull design and that the 43 addresses those problems, but what engines are in the 43?
So another 420 horsepower required over and above the sterndriven 520 hp!! Just goes to show the enormous amount of extra required to provide similar performance. Even the V40 which boasts less performance in the shaft driven version requires around 340 hp more.
Of course for performance one can equally sustitute fuel economy in the argument.
I just think that the shaft drive holy grail is somewhat overstated. IMHO for leisure sports cruisers up to around 40 foot the sterndrive is the preferred option.