CSW = County Station Wagon... one with windows and seats in the back, rear and side steps, as opposed to the commercial van or pick-up models.
The very new 90's have forward facing seats and lap and diagonal 3 point seat belts... but you're still looking at the better part of twice your budget to afford one and there's only 2 rear seats instead of the 4 side facing ones. You can retro fit lap belt type seatbelts to the earlier models... but a lap belt on a side facing seat is a waste of time really as likely to cause injury in the event of an accident as it is to prevent it.
I also think you're underestimating the size of a 90... mine towers over a Disco 1 and is only a fraction shorter. The 110 is a big beast and if you don't need the potential for up to 12 seats then the disco is definitely the best bet - particularly for the money, you get a hell of a lot more Disco per pound than defender. You'd also be able to keep the CTR

From a comfort and driving position point of view the disco rivals the early Range Rover - not to be sniffed at since the defender can only be described as 'rustic' at best. They're geared differently too, so much more comfortable at 70 on the motorway than a defender, which cruises best at 60 or less.
I used to drive MR2's, including a 260bhp turbo, before buying a real car (1993 Defender 90 200Tdi), so I know where you're coming from re your boy racerhood. Speaking as one who converted from fast road and trackdays to off road and plodding down the motorway at 55 - there's no looking back.
Lastly, don't be put off the disco because it doesn't look like a 'real landrover' - the underpinnings are more or less identical, hence the great offroad ability - not something which can be said for the freelander, which is a totally different beast underneath.
Cheers,