Hi Guys im new to Sonar X3....im thinking of getting Tascam US 2x2 to route my audio & midi thru this unit...is this a good idea????
Im on Pc windows 8...8 gig Ram...i5

I am sure it would work OK but I would not own one. The problem I have with it is similar to it's competition, they are bus powered devices. I prefer an interface which is not bus powered. This usually means a slightly more expensive unit.

what other ways are there????

I believe most of the 2x2's are bus powered. In the Tascam line the US 4x4 uses a separate AC adapter.

You can get an AC adapter for the US 2x2.

From what I read the optional power supply is used when connected to an iOS device. Does this mean it will also work when connected to a PC?

Hi. I' m not sure about your budget, but I had the Lexicon I|O 42, and was very pleased with it. A little weird in the gain stage on the pres, but totally stabile and clean sounding. They also have the 22 with 2 in, 2 out.

I would definitely take a look at some of the Focusrite Interfaces.

I don't see why the AC adapter wouldn't work when connected to a PC, they probably mention it for the iOS device because they don't provide enough power to run it or it would drain the battery way too fast. My motherboard doesn't provide enough power for it but I plugged it into a powered USB hub and it works perfect now.

The TASCAM US-2x2 is designed to take its power from the USB bus with Mac or Windows. However, if the computer doesn't provide sufficient power, then you need to use the optional AC adapter. The US-2x2 must use the AC adapter with iOS devices. The US-4x4 cannot be bus-powered, and requires using its included adapter for computers or iOs.
 
The main attributes of these interfaces are the mic preamp quality, the inclusion of 5-pin DIN connectors for MIDI in and MIDI out, and iOS compatibility (FWIW the Focusrite 2i2 is not spec'ed as working with iOS). Also, the zero-latency monitoring is stereo and crossfadable, not just switched, and TASCAM is now writing its own drivers in-house, which improves performance considerably compared to the previous generation whose drivers were supplied by a third party.
 
Disclaimer: TASCAM is part of Gibson Brands, as is Cakewalk. OTOH that means SONAR gets tested with the interface 
 
Here's an article I wrote about latency that mentions the TASCAM interfaces.
 
Basics: Five Questions About Latency and Computer Recording