Well I can tell you a little, most of the guys on here are more experienced than me, I have a 1999 4/4 4 seater (why I call myself chris444) Morgans made about 260 by guess of this type of car between 1998 and 2006, £25k should get you one with varying amounts of change.
Why is as follows
1. as a 4 seater it is practical, it can carry 4 persons all of them quite large
2. as a single/2 up car your luggage goes inside, rear seats fold down to give you a pick up!
3. Insurance is reasonable
4. They will fall in the price bracket under £25k
5, 4 seaters are harder to find, only about 1 in 10 Morgans have 4 seats, older cars pre 1998 as 4 seaters have smaller tubs and the rear seats are a bit of a perch.
6. The 1800 zetec E will give decent performance and has huge tuning potential easy to fit a 2 litre if required.
7. Easy to customise lots of bits available, motalita wheels, mesh grill, librands rack, walnut dash, wire wheels, etc etc.
8. The body is wider than all other Morgans, think chassis is is plus 8, later 4 seaters are based on the roadster and are narrow inside, this means even wide bodied owners do not rub shoulders
9. Scuttle is an inch higher so more space under the dash
10. I have one- but no its not for sale.
If this does not appeal well plenty of choice, my local dealer at Berrybrook have a good web site (as do many others) but at £25k doubt you would get a decent plus 8. The 2 litre car is best for balance as a sports car and drives nicely a late plus 4 2 litre Duratec is a very nice drive but will hold value less than a 4 seater - personal view.
Good luck.