Hi Nae A friend has a Wii and uses the games such as the tennis as a work out (think they have work out ones as well??). She also has the..oh I can't remember her name the Trainer from the Biggest Loser DVD's and says they are excellent! So maybe rather than a machine an excersie DVD that you can do at home. Pilates is excellent for targeting areas so if you have a physio in yoour area perhaps Pilates classes as that will get you out of the house and excercising Some of them do Mum's and Bubs classes.
I had an ab-trainer once and it ended up at the tip, have also tried an excerise bike and just find it hard to stick to machines if they are in the home.

Good luck

x Heather