The 834P would be one of your best choices and you can easily find one used here on Audiogon for well under $1100 (around $600 in black). They are plentiful (for good reason) and easy to resell should you wish to try something different. I've owned two of these in the past (one with volume control, the other without) and they are an exceptional product. Nickt is mistaken about there not being enough gain for your Shelter. The 834P will handle cartridges down to .22mV and your Shelter is .4mV. I believe the MC gain is 68dB, more than enough. As to impedance, the MM section is set at 47K ohms and the MC is under 100 ohms. You will have no compatibility issues.
