I thought I would ask some advice on garden tilling.  I am planting a garden this year for the first time in many years.  I grew up with a garden, but this is "my" first family sized garden.  It is currently 50' x ~100".  I have a New Holland TC35A tractor and several implements for gardening (plow, disc harrow, cultivator, bedder), but not a tiller.  I do have a nice (older model) Troy Bilt Horse tiller.  It is a rear tine tiller that I bought last Fall.  I think it would do well in ground that was previously plowed and then hit with the harrows.  
Question: Would a PTO powered tiller make gardening much easier vs. the Troy Bilt horse?  Is it worth the extra expense?  
It would be nice to have a PTO tiller to use around our property planting grass.  I am sure that I will find many uses for it.  It is hard to justify another $2K for an implement, but it would be nice.  
My plan now is to use the tractor and implements to plant the garden.  I might till the entire garden with the horse once and then use it to till in between the rows.  I will use the bedder to lay off the rows and the cultivator for weed control until the plants get too tall.  
Does anyone have experience with a Horse vs. a PTO tiller under similar circumstances?  Any advice or comments would be appreciated.