Wiring in this car is actually easy...
Buy the right wire harness, then wire it right up and plug it in, the OEM subs are just as easy to get to work, you don't need to even hook them up if your running a real sub (when running a real sub, I recommend removing them completely, giving a good un-insulated path for the sound to travel through and extra height for a box). plan on losing the center effect speakers as no aftermarket head unit with have a channel to properly utilize them. and a steering wheel adapter is very easy to wire in (just four or five wires that need to be tapped into)
The biggest problem you're gonna run into is finding a radio that looks OEM enough for you, as most brands are going for a rather aggressive look to target the youths out there.
Doing it yourself will save quite a bit of labor, dash kits can usually be found for as low as $10, $5-10 for a wire harness, a bit over $50 for a steering wheel control adapter (I really like the Metra ASWC) and then the radio itself. good basic ones can be had for around $100 easy.
Things I would recommend it having:
a dedicated subwoofer output with level control either for the OEM or an aftermarket sub
a HPF or High Pass Filter. this will filter out all the bass that the sub plays so the internal amp can focus on only mids and highs (much cleaner and clearer sound)
Steering wheel compatible (not all radio will even work with SW controls, half the radios from most good brands should have no problem)
adjustable colors display/buttons. not to be girly about looks, but a huge part of it looking OEM is making the colors of the buttons perfectly match the rest of the dash. otherwise is will it will stick out like a sore thumb at night...
pretty much all radios that have those features will also have USB for ipod or M3s on flash. I know its not something you're looking for, but nice to have, hell give it a try, you might be surprised at how much you like it. AND having as much as 20-50 full CDs on one $15 flash drive that can never get stuck inside a radio again... and is way easier to access and find VS multi CD changer.
also a lot of radios in that price range will feature Bluetooth. again while not something you're looking for, it really is a nice feature that bring the car into todays age... the two biggest benefits to this would be just having your phone automatically connect to the car every time you get in is nice and also help to keep it safe on the road... even if you the kind of person that "never talks while driving" its still nice just to be able to see who is calling you incase it might be important all with out ever removing the phone from your pocket, and if it is, just press one button and start talking to them just as safe as if you were talking to someone in your back seat. second would be if you do have a smartphone, it makes it a lot easier and cheaper to get navigation in the car. just connect through BT Audio, turn on and set the nav app, and then just start driving with guided direction spoken to you (also works great when combined with the next feature). and my favorite smartphone feature is Pandora radio. if you never used it before, its highly personalized radio stations tailored directly to what you like and dislike, oh yeah, and its free.
as far as good easy to use radios that fit feature wise both sony and pioneer make very good cheaper radios for about $100 without the BT (sony CDX-GT575UP, pioneer DEH-5600HD), and $130 with the BT(sony MEX-N5000BT, pioneer DEH6600BT).
standard CD decks are going to be the hardest to be looking OEM, but most touch screen models can look just as good (if not better) than the factory nav system! for instance, have the AVH-3600bhs and love it, great sound, and even though its frame frame is black instead of silver, with the silver dash kit, it really doesn't look that much different from a OEM nav system... while that one is quite a bit out of your price range, it does have a "little brother" (AVH-X1500DVD) that just doesn't have Bluetooth (or HD radio, which I could really care less about) and can be found pretty easily right now on clearance (it is a 2013 model but the new version looks exactly the same and is 99% the same inside) for a little over $200.
might be worth looking into.
