From everything I've read, you wil have a more reliable car with a TD5 DiscoII. They don't suffer body rust Di's do, but you may find some chassis rust but nothing terminal.
They come in auto and manual of course but I've only owned autos and they've all had cruise.
Even if a manual box car doesn't have it, because it is governed by electronics the car will be prepared in the loom for it so you'll just need to buy switches. Ebay sellers do kits for about £50 I believe.
There are several known issues with TD5, most of which are easy and cheap to resolve:
1. Leaking fuel injector loom puts oil near the ECU - new one costs about £30 but I just replace the two blue 'o' rings cost¨£2 !!
2. Leaking Fuel Pressure regulator (FPR) again an 'o'ring issue. £2
3. Camshaft seal leaking - ditto £1
4. In-tank fuel pump going pop - cost to replace £120-200, easy job. However, if you change the fuel filters regularly, and clean the pump filter occasionally you reduce the risks of trouble;
5. Rear air suspension sagging - anything over 5 yrs old just replace the bags and ride height sensors, very easy job. Bags cost £63+vat each and sensor are £20-30 each.
Of course they don't all have these problems, but some have some.
They are a truly brilliant car on and offroad and I love mine. They respond well to modding, De-EGR, De-Catt and remap.
Good luck
Dave