Gmail on HTC Touch Diamond

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Hey fellow geeks--

A question for you geniuses that I haven't been able to figure out.

When I used the Gmail Java App on my old phones (A900, UpStage) the emails would never download to my phone, but I would be able to view, compose, and delete emails just like I was on the computer. I really liked this because I would have all of my emails there at my disposal, but they wouldn't slow down my device.

Now with my Diamond, since I cannot download the Gmail Java App, I'm unsure how to recreate this email experience. I've set up IMAP, but it doesn't make sense to download all of my 500+ emails to my phone, most of which are there for backup. It is making Outlook Express sluggish. I would like to access my email as if I were on gmail.com, but the best I can think of is set my homepage on iGoogle. This is what I did on my last phone, the Touch, but with the beautiful TouchFlo 3D, I don't want to do the same with my Diamond.

What should I do? What do you guys do for email?