It really all depends on how you spend money and how you want to use your points. A very good rundown on credit card signup bonuses is at Gary Leff's View from the Wing Blog. He just posted an updated version today, plus you can search his previous posts for additional information:
http://boardingarea.com/viewfromthewing/

Venture is good for cash back on travel related purchases, but it may not be the best in that category (I do have one). If you want points for travel, then you might want to consider something else - there are some very good offers on other cards - but it depends on who you fly.