Yes, a lever type (dutch) press will give a consistent pressure, while a spring type will supply less pressure as soon as the cheese compresses. What's more, a lever type is simpler to build and maintain, at least in my ever-so-humble opinion.
Do a search here on the SturdyPress, or check out the website here: sturdypress.com. Bob, the owner/designer, is an active participant on this forum. Disclaimer: I have no financial interest, and in fact don't even own a SturdyPress, having made my own frankenpress design instead -- but in my opinion, if you are going to purchase a press, it would be very hard to beat the SturdyPress for ease of use, available pressure, and price.
Note that if you are interested in making a press, rather than purchasing one, there are various plans here on the forum and elsewhere on the web.