It's no problem! I've actually always wanted a 370 so I pretty much made the decision it will be the next car I get. As you can see from my current one which was completely stock when I got it, I like to modify cars lol. I wouldn't need a blue one, If I had to choose a color I want I would prefer white or black. I would definitely want manual and preferably the sport package. What does the touring package come with that the sport doesn't have?
The sports package comes with rays-forged rims (way prettier than mine), a limited-slip differential (essential for going fast, I've almost died multiple times due to lack of this), a spoiler (mine has this anyway), and big brakes. The biggest thing for you in the sports package, however, is the automatic downshift revmatch. The engine will automatically blip downshifts to match revs (when turned on) making your driving experience not only 100x smoother but taking out the need for heel-toe shifting in the car. It's pretty amazing. Anyway, the 370z isn't actually a great car for modding. The car isn't very popular so modification kits are expensive (twin turbos costing upwards of 10 grand, intake exhaust hovering around 1k each, long-tube headers are 1k or you can get high-flow cats or test pipes for 200-600 depending on which and resonation) but it sure is a fun car to drive. I'm planning on getting a quaife differential and 4.08 gears, which will scrape off a few mpg on the highway but it'll keep me in the powerband so my acceleration will be incomparable to a stock 370z. The gears plus high quality differential should cut more than half a second off the 1/4 mile time, which would be longer than a bus in practice. It puts me in the same league as Camaro SSes and slow 2013 Mustang GT drivers. IMO it's probably the most effective mod you can do for cheap. It costs about $1k for the differential and about $500 for the gears, plus about $500 for professional installation.
Also, just a general tip. Black is a loving awful color to have your paint in. You see every single blemish, scratch, swirl mark, water mark, and dust particle on your entire car. Unless your car is garage kept at home and at work/school, your car won't ever look 100%. I wash my car every week and the only time it ever looks completely clean is while it's still wet. It's just a really difficult color, it really shows everything. In comparison my friend has a grey one and it shows nothing unless you look at a certain angle. You could probably leave a white one on the street for a month before people would notice the residue buildup. Don't get me wrong, it still looks good, but in my particular situation I have waterspots that are pretty obvious up-close. I need to get a paint correction to get rid of them, but in the mean time my car never looks clean. The only color I'd trade my car for is Monterey Blue. I have a friend with that car
(img of his car here) and I love what he's done with it.