I need you to tell me what is the best Scuba Regulator for someone who is new at diving, will be diving lakes in Arkansas, oceans on vacation, looking to go to rescue and later instructor. I am Nitrox certified also. I will not be doing extreme cold dives

Choosing the right scuba regulator is essential for both comfort and safety, especially as you embark on your diving journey and look toward advanced certifications. Since you're a beginner with aspirations for rescue and instructing and have Nitrox certification, you’ll need a reliable, versatile, and user-friendly regulator. Here are some options to consider:

### Recommended Scuba Regulators for Beginners

1. **Apeks XTX 50**
   - **Type:** Balanced diaphragm
   - **Features:** 
     - Suitable for both cold and warm waters (though not aiming for extreme cold, it's still versatile).
     - Excellent airflow and a high-performance second stage.
     - User adjustable breathing resistance control.
     - Great for Nitrox (up to 40% O2).
   - **Pros:** Comfortable and intuitive, good for a wide range of diving situations.

2. **Scubapro MK11/A1**
   - **Type:** Balanced piston
   - **Features:**
     - Lightweight and compact.
     - Simple design that is easy to maintain.
     - Excellent airflow and compatible with Nitrox.
   - **Pros:** Reliable with a good reputation, suitable for warm and moderate diving conditions.

3. **Mares Puck Rock Regulator**
   - **Type:** Balanced diaphragm
   - **Features:** 
     - Compact and lightweight, ideal for travel.
     - Good performance at various depths.
     - Nitrox compatible.
   - **Pros:** Affordable and great for beginners, excellent value for quality.

4. **Oceanic Alpha 10**
   - **Type:** Piston
   - **Features:**
     - Easiest breathing regulator available.
     - Environmentally sealed, making it versatile for different conditions.
     - Lightweight and compact.
     - Compatible with nitrox up to 40% O2.
   - **Pros:** Very user-friendly, excellent choice for beginners.

5. **TUSA RS-130**
   - **Type:** Balanced diaphragm
   - **Features:**
     - Lightweight with an ergonomic design.
     - Offers a high flow rate and easy breathing.
     - Nitrox compatible.
   - **Pros:** Good entry-level price and performance.

### Additional Considerations

- **Budget:** Entry-level regulators can range from $200 to $600+. Higher-end models might be more expensive but provide better performance and longevity.
- **Serviceability:** Consider whether you can easily find service centers for the chosen brand, especially after your initial warranty period.
- **Comfort:** Fit and comfort are crucial, so if possible, try different models at a dive shop.
- **Future Proofing:** Since you plan to continue to advanced levels like rescue and instructing, choose a regulator that suits not only your beginner needs but is also robust enough for more demanding diving environments down the line.

### Conclusion

Each of these regulators offers a good balance of performance, comfort, and reliability for a beginner who plans on progressing in the diving world. It’s always a good idea to test dive equipment in a controlled setting before making a purchase, so consider renting a few models to find out what you like best. Happy diving!