Hula--Here in the States, Nintendo issued a release saying Wiis were going to be scarce again this year because they can't keep up with the demand around X-Mas. I bought one for DH's b-day a few weeks ago, and it was easy to find, but have noticed nobody has them in stock now.
Draculasmummy-Totally respect how you feel, but your 3 oldest would love a Wii, I'm afraid. I'm not into the whole gaming thing at all, and have never played anything PC or console, but love our Wii, too. We mostly play the Wii Sports that came with the system, and the dorky little Wii Play games, and my 4 and 2 year old love them. (The 2 year old usually plays with mom or dad, but our 4 year old beat both of us in bowling the 1st time we played)
I agree with having them play outside, and DS asks to play a lot, but we keep playing time down, and he doesn't get to play. Yesterday it was pouring all day, and it was nice to get out the Dance Dance Revolution game out and have the 2 of them stomp and jump about and exercise.
All of us enjoy playing as a family. We have 2 nights where we play for an hour, hour and a half a week, and we all enjoy it. I got the DDR game, and use it as a workout when DD is sleeping and DS is at school, which helps me exercise, since I can't leave her in the house and go for a run or whatever. DH has a few games he likes to play sometimes when the kids are asleep. I agree too many kids stay in front of gaming systems like that for far too long, but it sounds like you'd do a good job regulating playing time, and they'd enjoy it, trust me. (But yes, I'm thinking your DH is wanting it at least a little bit for himself )