Cyclocross Bike Build Advice?

I bought this bicyle's bike frame & fork. http://www.marinbikes.com/2011/bike_specs.php?serialnum=1175&Toscana I'm scouting out what wheels/rims to buy for my build but I'm not familiar with brands and value. Just looking for some input. I plan to buy the major components then work with my local... show more I bought this bicyle's bike frame & fork.

http://www.marinbikes.com/2011/bike_specs.php?serialnum=1175&Toscana

I'm scouting out what wheels/rims to buy for my build but I'm not familiar with brands and value. Just looking for some input. I plan to buy the major components then work with my local bike shop to put it all together. Would like to find something on ebay or CL for no more than 400$.

I live and almost exclusively ride in NYC, I got the Cyclocross frame for weekend/vacation trail runs.

Also, was thinking about bullhorn handlebars, any thoughts/concerns? Suggestions?

I'm pretty new to this and trying to learn as I go. if you have any advice about this endeavour would love to hear it.

O and should the cups for a headset be locked securely into the frame or is alright if they are loose and become tightened when the fork is attached.

Thanks in advance.
Update: the budget for my WHEELS is 400$...
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