1) The main problem with most electrics is they don't move enough air compared to the mechanical fan. Really good electrics (I think the 500E crowd uses a 'SPAL' fan, whatever that is) cost as much as a new mechanical clutch (~$300). How bad do you want to lose the stock setup, & why?
2) If you get an electric, you NEED (not 'want', not 'maybe', NEED!) to upgrade the alternator. The stock 70A unit is almost useless. Get a 100-120A unit from late mid/late 90's Mercedes at a minimum, and I'd recommend finding a 143-150A unit (late V8's only). It's a mechanical bolt-in but you'll need to run larger wire (4ga at least) to replace the pair of dinky 10ga stock wires from alternator to battery, and tap the fan feed directly from that.
3) The dual-fan setup in the link you posted might work, if it fits. The single fan isn't enough.
Let us know what you end up doing and how it works out...
