DPI and PPI are very different things. PPI is what matters in the file. It is the number of pixels that make up each inch, thereby defining how detailed and fine the image is. For small prints (8x10 or smaller), you should have close to 300 pixels per inch, or approximately 2400x3000 pixels for a "flawless" 8x10 print. You can get by with 200 ppi without many problems, but you will be able to notice a lack of fine deatils if you go right up close to it. As the print gets larger, the PPI gets more forgiving. For example, once you hit 11x14 inches you can get away with 150 pixels per inch, because artwork at this size tends to be framed and people do not stand as close to the image. So for 11x14 you can render at 1650x2100 pixels. If you look up close at it you will definitely be able to see the small pixels, but if it's framed you won't see this. You can stay at around 150 PPI up until about 20x30 inches, and then you can drop it down to about 100 ppi. I would not go below 100 ppi unless you are printing a very large image (4x6 feet or larger) that will only be viewed from eight feet away or more, as people do tend to stand close enough to see the pixels otherwise. DPI, or dots per inch, is a function of the printer you ar using. It is the amount of dots of ink for each inch on the paper, and this number is always much higher than the number of pixels in the image. When you think about it, each dot from the printer is round and "fuzzy" as it is absorbed into the paper. If there was only one dot for each pixel, the image would not be very detailed at all because you are trying to define a sharp, square pixel with one fuzzy, round dot. As such, you usually need to print at least at 720 DPI which will produce about four dots of ink for each pixel (assuming the original image is at 300 pixels per inch). This will give each pixel a rounded square appearance. For detailed photos you need a printer that can handle 1440 DPI or better. This ensures that at least 16 dots of ink are being used for each pixel that is printed, esuring that the pixel looks very close to a square and will not blend into the other pixels around it due to dots are too large. For museum quality prints I print at 2880 DPI, which uses something like 64 dots for each pixel. Between 1440 and 2880 there is very little difference to the untrained eye, but you can see it in photographs where there is a lot of very fine grain such as in black and white scans. Also, I can tell you that most printing places will overcharge you terribly for prints and you're better off buying a decent printer and doing them yourself. Get an epson R1800 or R2400 printer and you can make prints that are better than anything you can buy for a third of the cost, and you can get them right away! You also have the benefit of getting to choose your papers and have much more control over the final output. Just my 2 cents In closing, you should re-render at about 2000x3000 pixels, and this will allow you to make prints up to 11x14 with no issues.