Houston Garden Wedding

Any one have any great suggestions for place for an outdoor garden wedding in Houston?
Or have opinions on the places I have listed?

I have so far:
Avant Garden - looks good haven't seen yet
Gardens at Bammel Lane - would require a lot DIY
River Oaks Graden Club The Forum - looks great haven't been yet
Houston Zoo - kinda expensive
5226 Elm - really expensive
The Parador - expensive


Any comments are appreciated!
Thanks!
Sharon