Good luck with your move! We've been in Dubai nearly 5 months now and are loving it..........
The biggest headache is sorting schools - we applied for 5 and all we got were tales of woe but in the end got offered 4 places! As my eldest started in the Easter term they could only accept international applications so we got priority over children on the waiting list currently living here. Mine are at JPS which we have found brilliant and they are both very happy there.
In terms of package we get our housing paid and a proportion of schooling and based on DHs monthly salary we're probably not dissimilar to your offer overall - we're not saving anything at the moment as there is a lot of expense to start (we've bought a 2nd car outright, new furniture etc) but we have a great lifestyle, plenty of cash to go out and do nice things and I think will start saving in the next 6 months.
I use a maid agency for a cleaner and ironer twice a week - shes brilliant so I tip quite a lot but it costs 300aed a week.
We live in Springs and our 3 bed villa (good sizes plus big garden and 2 communal pools) was 150000aed, I think they're going for around 165000 now though.
But mostly we love the outdoor lifestyle, even though its very very hot we go to the pool everyday, my boys are great swimmers now! There are play centres everywhere (and considerably cleaner and nicer than UK ones) so a 9.5 week summer holiday flew by, I'd have struggled with 6 weeks in UK...........
I've made lovely friends, Expatwoman have lots of coffee mornings around the city. Everyone is friendly and willing to help, service is great, everywhere is child friendly, I really haven't missed home at all so far.
In terms of decorating/curtains - you will find there is someone somewhere who can do anything for you in Dubai!! There's goof facebook groups and expatwoman forum so if you ask for recommendations you'll always get a good response.