Twiglet is looking for a slightly lower ride height, without going overly firm. 30mill would be ott so that leaves mv6 lsc. Flaw in the plan is self levelling shocks aren't too clever as dampers, but as it's an estate and carrys load I gather, keep SL.
Correct Chris. I really don't want to lose the self leveling if I can help it. I realise this is always going to be a compromise, but surely at the end of the day, MV6 lsc with S/L shocks can only ever be an improvement on standard elite suspension? 
on my 1999 3.0MV6 estate im running 30mm drop front springs & bmw E46 rear spings giving me a 45mm drop on rear so she sits level, ive kept my S/L rear shocks but adjusted the hight sensor in which they get pressurised, prob easyer on a 4post ramp but 4 wheel ramps do the job so you can get under it, with car empty it sits perfect!! nice & level, i adjusted the sensor just under ride hight so they have a small amount of psi to inflate the bags, i then loaded the boot with as much stuff + bit more that i would norm carry & then started up car, it lifted it up level again, car drives well but kinda soft on heavy hoofing round roundabouts when loaded, but if you start playing with a piece from this & lets try that etc like me it will take you ages to get a happy medium, buy a proven kit & check the mmdrop before you buy because some dont drop the rears!!! only a 30mm front rear 0mm
BUT ONLY 2 ISSUES!! 45mm drop on rear is too much so on mv6 over standard thats 60mm im running to get it level! i have to cross bridge speedbumps sideways & i still hit the cats & center boxes!! or slam towbar into hump if i go over slightly to quick! & by quick i mean over 5-10mph so you can tell i piss other road users off alot!! You will need to reset your rear camber my rears are pitched in at top but havent been able to adjust as they are seized!!
now tyres, i got the car on 15"steels with 185/70/15s it spun both rears on every junction! then fitted 225/60/15s & had no probs drives great bumps in road hardly noticable, 225/55/16s would be standard size on elite 16 wheels,
i then fitted 17s 225 45 17 winter tyres as i had a set, but way to small look stupid bit bumpy ride & speedo wrong but handled great in that size etc! tbh,
The rears were low so fitted new uniroyal2s 245/40/17s & still drove great but a little more bumpy from rear,
Then wore fronts out & fitted partworn 245/40/17s all round!! WOW Big mistake!! very hard ride & from the front wondered & pulls all over the place nearly wrote car off few times! & wont corner in wet as front size to wide & more grip from rear!
Now as for 19s!! ive got a set off an oof member who's already commented on here! 8.5"js all round running a 235/35/19 front & 265/30/19 rear but ive managed 2 source a matching pair of 10"j rears! but im going up to a 275/35/19 so the ride wont be as harsh! i hope!! i keep you posted on how they go!
ive got a mate whos got a set of 5 vectra vxr
19" snowflakes for £450/£500but if you buy vectra astra corsa 5x110 wheels you will need a 5/10mm spacer & longer bolts due to offset!!
If anybody wishes to view a pic of my estate on the 15s or 17s slammed on its arse PM Me with a mob number & i send you a pic
2bh eveyone has there own opinion on what drives best when it comes to tyres/wheels but if you have 17" fit a 235 45 17 uniroyal2 grip like hell wet or dry!! or a 16" wheel 225/55/16 is a good happy medium but tyres are getting harder to find...