No worries :) I know that pull on's are the more traditional, and the majority like them over the zippers. Even my Coach wont use zip up's - but I personally, like them.
I used Paddock Boots and 1/2 chaps for 1 year...well, maybe not even that long. The barn I boarded at, everyone used them - so I thought why not join in, they must be using them for a reason. So I got myself a whole set up - hated them.
I hated sitting down and having to put on the paddock boots, then I had to spend the time getting the blasted 1/2 chaps on - hated that just as much. So I got rid of them.
I bought my first pair of zip up boots - Mountain Horse and was hooked from that day on.
To the OP - get a good pair of synthetic tall boots - like Saxon Equileather, or go to www.tacktrader.com
and look for used boots, or even ebay