Fruitstick talks a lot of sense.
You should seriously think about trying the return to work (either full or part time hours) for maybe 6-12 months. If you hate it you can then choose to be a SAHM later knowing that being a WOHM mum wasn't for you and knowing what you really are walking away from, but if you choose to walk away from it to be a SAHM and later decide that that isn't for you, it will be much harder for you to get back into a job you love as much for as much money and you might end up resentful of what you gave up. Also if you set yourself a 6-12 month trial period, you will get over the initial few months when you return where, if you're anything like me, you will hate it and just want to be with your baby!
I was earning similar to you, and DH was earning slightly less when I went on mat leave, but he had bigger career prospects and is now earning more.
I went back 3 days a week - still a bloody amazing salary on part time hours and very important for family finances, and for me balanced out the needs of me, my child and our family much better than working full time. One big proviso for me was that we went down the nanny route, and it was wonderful. I was happy knowing he was at home and well cared for rather than in a nursery setting (which were pretty grim near me). If you can afford to give up 60k completely then you can definitely afford to have a nanny, and I would suggest doing this, particularly if you decide to do a 'trial' period of working, as it will make your transition to work much easier than dealing with strict nursery drop off and illness policies. After a year, we moved house to a new area and found a lovely small nursery. Moved DS there just before his 2nd birthday when he seemed so much more ready for it, and he is thriving, and we have more disposable income. But I don't regret the money we spent on a nanny for that first year at all - money worth spending.
Like others have said, I actually think my presence at home will be more important when DCs are at school, so am working towards a situation where I can be more flexible then by earning money now to pay down extra on mortgage etc.
I empathise. Many people will be jealous of your situation as you are in a really lucky position - but that can make it hard as it isn't a no-brainer to either work or SAH.