Ohh right ok. I think the 182 is a good everyday car but it's a bit of an odd situation having two cars with very similar capabilities on the drive. If I was having the Williams and another car it would actually be a 172 as the 172 is a bit cheaper and does do slightly better mpg anyway. I think if you're having those two cars you need to have marked out what car is no 1 and what is no 2 and where your time and effort is going to go.
A little about my experiences....
I had a Williams and a 172 for a while but in the end let the Williams go. The problem for me was the 172 did what the Williams did better in most departments, I know this will be met with alot of cynicism from the Williams crew but for me, it's what I found.
Depending on the set-up of the Williams it may grate on you, it may not. If it has coilovers and a big exhaust it will, if it's standard it maybe alot better. My Williams was owned for about 4 years and as a daily driver for two, covering about 35 miles per day at that stage. A small issue which is overlooked is these cars have very short gear-ratios compared to 1*2's. Sitting at 80mph is about 4k. If you've got a loud exhaust it can become boomy and tiresome. Clearly though, that's not the cars fault more your choice in exhaust.
Things which are no longer at the forefront of my mind but used to bug me about the Williams was the long brake pedal travel, tappety engine from cold and constant rust worries.
Saying this, the cars are great. They look iconic, have a great seating position and very good feel. There is a reason why they still keep winning awards and coming top of polls.
In the long run, lots of money may need to be spent keeping it spanking but so long as you've made that mental jump and know it's more than likley going to be just a weekend and meet car it'll be fine.
When the 172 became my no 1 car it was time to let the Williams go. I will have another, just a 1 this time. What's different is I know it's merley going to be an ornament and a 1 day a week car which is covered up the rest of the time.
I have seen pics of that 3 on WC and it looks very nice. I think the 3's look the best tbh as Williams blue can look a little flat imo.