I've been using MS streets from the minute I got my GPS and I think it works pretty awesome, although did find the same problem you do. I'm currently trying out the Voice enabled Destinator 3. The trial version and all the maps are availible for like 15 bucks. The full program runs around 170 I think. My take on it compared to MS is..
it's a great voice guidance system with visual aids that will flash the complete screen at the turn and verbaly anounce aprroaching 500-200 and less yards to turn. It also does a better job in it's display of the surrounding areas you drive through, but I feel as though MS streets gave better directions. It seems the two programs have completely different ways of routing you, but I think I'm being lead through neighborhoods to cut corners because it's stuck in "quickest route." I think I'm gonna stick with MS though, since it's only 30 bucks. I figure I can make up for the lack of verbal commands by relying on my keen pilotage skills. goodluck
ps, how do you sink MS street with your computer's clock.. it start my trip at 9 everytime regardless.
[------|-] 95% computer... is it ever really done?