I'd say keep an eye out on your local craigslist for a used cyclocross bike in your size and keep them both. A cyclocross bike can probably cover all the types of riding you want to do, so you could probably sell the 7.4 once you decide you like it. If not, you haven't gotten rid of your 7.4 for nothing. If you know you're going to keep them both and use them for different purposes, you can skip the cyclocross and go for a full on road bike. Either way, used will save you a lot of money if you get something in good repair that fits you.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"