建筑学专业设计制图用什么电脑比较好？

你列的这几款软件里以Revit软件系统需求最高。你可以参考一下欧特克官方给出的Revit2015系列最低系统要求：
操作系统：Win7 64-bit版本
CPU：奔腾、至强、i系列或者AMD同等性能；说白了普通CPU性能够用了。

内存：4G；

显示分辨率：1,280 x 1,024，这个需要显卡跟显示器同时支持。
显卡也是一般的显卡都可以用了。

下面是英文原版的最低要求。
Minimum: Entry-Level ConfigurationOperating System ¹Microsoft® Windows® 7 SP1 64-bit:
Windows 7 Enterprise, Ultimate, Professional, or Home Premium

Microsoft® Windows® 8 64-bit:
Windows 8 Enterprise, Pro, or Windows 8

Microsoft® Windows® 8.1 64-bit:
Windows 8.1 Enterprise, Pro, or Windows 8.1
CPU TypeSingle- or Multi-Core Intel® Pentium®, Xeon®, or i-Series processor or AMD® equivalent with SSE2 technology. Highest affordable CPU speed rating recommended.

Autodesk® Revit® software products will use multiple cores for many tasks, using up to 16 cores for near-photorealistic rendering operations.Memory4 GB RAM
Usually sufficient for a typical editing session for a single model up to approximately 100 MB on disk. This estimate is based on internal testing and customer reports. Individual models will vary in their use of computer resources and performance characteristics.
Models created in previous versions of Revit software products may require more available memory for the one-time upgrade process.
Video Display1,280 x 1,024 with true color
DPI Display Setting: 150% or lessVideo AdapterBasic Graphics:
Display adapter capable of 24-bit color

Advanced Graphics:
DirectX® 11 capable graphics card with Shader Model 3 as recommended by Autodesk.Disk Space5 GB free disk spaceMediaDownload or installation from DVD9 or USB keyPointing DeviceMS-Mouse or 3Dconnexion® compliant deviceBrowserMicrosoft® Internet Explorer® 7.0 (or later)ConnectivityInternet connection for license registration and prerequisite component download

预算如何？对大小外观尺寸品牌有无要求？