Jeff, check out this website about the best website designs -- http://www.thebestdesigns.com/
If I were you, I would start on Version 2.0 of your website while leaving your current one live. One thing to keep in mind is that there are hundreds of other landscape companies that have websites, and in many cases the website will be the first impression a prospect has with that company. Every good website will have quality/verifiable content that is easy to read, easy-to-use navigation, a smart use of graphical content, and most importantly: the ability to be easily found. No technologically advanced website is worth anything if it can't be found.
If you have trouble with HTML/XML coding, a good FREE program available for download is this: http://www.serif.com/web-design-software/?mc=FSSWEBPLUS
It is classified as a what-you-see-is-what-you-get software (WYSIWYG for short). No coding knowledge is necessary. Hope this helps in your success.