I guessing you obtained your Private with a steam gauge panel. If so that is great. Combining a GNS 430 or 530 with that for your instrument rating also makes for an easier transition to a G1000 later. A relatively small, though very important, portion of your instrument rating will involve GPS/GNS. This can and is done with a 430 all the time. Although the 430 is becoming somewhat outdated, it remains a very viable piece of equipment and has been retrofitted in countless steam gauge panels. There are pros and cons to most situations though choice B would probably be my mine. This way you will have a slightly easier time with your instrument training, be able to make cost sharing flights, with your friends to build time and experience cheaper (as you will have already accomplished most of the aircraft checkouts via your training) and can then transition to the G1000 more easily and at your leisure. PS, Now that you will be adding GPS to your repertoire, ALWAYS verify which mode you are operating in!!!