I don't know any good deals but congrats on on the child you'll be having soon! Good choice on choosing a 335i but I'd go with a n54 motor over the n55 motor if you like going fast. The n54 with a simple $400 tune will be pushing over 350whp. The JB4 tune takes about 15-20 mins to install/uninstall and the dealer never has any idea due to the tuners code delete option
If you don't plan to performance mod your 335 though, just go n55 and I'm sure you'll be satisfied.