No there is no limit besides tiles and cash. Factories, labs, morale boosters, farms... cost cash, hell the trade resorts cost cash. You have to be able to generate cash so I go for a more modest approach. On a typical 10 planet.
1 - Stardock
2 - Factories (may buy one outright if early in the game)
1 - Market
2 - Labs
1 - Market
1 - Entertainment
1 - Culture
1 - ?? Food or Superproject.
Nominally I will wait on the food for the terraformed tiles though, morale and approval is huge especially if you don't have a good trade base or are in a small or tight corner and are not getting alot of tourist money. That cash from the markets is necessary to stop the hemmorage of your bank account.
Anyhow, hope that helps.
W/R
Suralle Straykat
Kat Lord @ Large
Good hunting... till we meet that is