Consider buying used, if your local hobby shop (LHS) carries this. I have bought used Kato’s and Atlas with great success. A cheaper but good switcher is Life Like’s sw9/12.
Power pack… go MRC. Again if you can get one used, buy it, this will save you money. Just try it out in the shop.
Welcome to N-scale! I recently return to the hobby after 15 years, and basically had to start over. For me, Life Like was a real budget saver. For a small switching layout, I think a SW9/1200 or a GP20 would work nice. I own a GP20 and it’s a great runner with a good slow speed range. I’ve heard great things about the SW9/1200 too. You should be able to pick either up for under $40. Try ebay.
There is a website I consult when looking over engines which reviews most all the N-scale engines:
I agree with Bruce that Life Life GP20 is a very smooth runner and I dare say a tad slower then my Atlas GP7s…I own 2 of the SW1200s,great little switchers…Another good buy.Check some of the internet shops and you can usually order 2 engines for the full price of 1 unit…
I have also found some great buys on the Atlas GP7. Less then $50.00 excluding shipping.Again shop around…
I own 4 of the Life-Like SW9/1200 switchers and have found them to be wonderfull little units. These units were Life-Like’s first attempt at getting into the higher quality market and was quite suscessfull. Their GP20 was next then some Alco products. They kept getting better and are now right with Atlas and Kato in quality and they cost less. As far as powerpacks go the MRC line enjoys a wonderful reputation and having used their tech support I feel they are the best. I own an Atlas unit too (retired) and it is good too but the MRC line gives you way more choices and like I stated their tech support is wonderful.