Americans plan to spend 16% more on high-tech gadgetry in the 2010 holiday season than they did in 2009, according to a survey of more than 1,000 U.S. consumers conducted for Retrevo, an online shopping and review site.

And what do these gadget-hungry shoppers plan to buy? Apple’s (AAPL) iPad or tablet computer was No. 1 on their list, followed by a laptop, an HDTV, an e-Reader and an MP3 Player.

Perhaps not surprisingly, men in the 18-to-34-year-old bracket who had already purchased an iPhone were the most likely to be shopping for more gadgetry.

Here’s how Retrevo summarizes its survey’s findings:

Who’s Buying Gadgets This Holiday Season?

• 70% of 18-34 year olds plan on buying gadgets this holiday season
• 53% of 35-54 year olds plan on buying gadgets this holiday season
• 31% of those 55 years old and up plan on buying gadgets this holiday season

Gadget Holiday Spending By Gender:

• 65% of men plan on buying gadgets this holiday season
• 52% of women plan on buying gadgets this holiday season

Gadget Holiday Spending By Smartphone Ownership:

• 83% of iPhone owners plan on buying gadgets this holiday season
• 75% of BlackBerry owners plan on buying gadgets this holiday season
• 72% of Android owners plan on buying gadgets this holiday season

[Follow Philip Elmer-DeWitt on Twitter @philiped]